I would say not (especially since we've seen the Red Wedding on the show) but you gotta be careful in this thread. Sometimes people can get up in arms over the smallest things.
I generally avoid posting in this thread (for two main reasons, the first being that I'm always hesitant to post any theories despite having never read the books in case they're correct and I'm labelled as some form of covert reader, and second as it's not a show with a major appeal to me [make no mistake though, I don't want to be spoiled as to what's going to happen]) but this is just something I wanted to pick up upon; if you've read the books but cannot be certain as to whether something has appeared in the show, the books, or both, it's wise to avoid commenting as for those who haven't it can end up very confusing when some individuals are implying scenes have happened, others are suggesting they haven't, and you're left in the middle to question your recollection of the scene (make no mistake I've no doubt you'd good intentions so I hope this doesn't come across as rude, particularly since ASIS wasn't particularly certain either). This scene has indeed been shown before. Daenery's visits the House of the Undying and walks through the throne room decrepit (as Bran saw in the most recent episode), and visits Khal Drogo (scene here:
http://www.youtube.com/watch?v=l7VuGknEfQY). EDIT: I see potential spoiler comments has been commented on by the moderators in the time I've had this post open so apologies.
With that out of the way, I must comment that one thing I enjoyed about this episode (which I felt was quite strong in terms of the cinematography, editing, and focus) was the use of food. The lavish banquet following The Hound and Arya's hunger last week (oh and that bar scene was absolutely superb), Stannis' wife's tale (and Stanis' complaint about the food) and the ravenous hunger of Bran's party really helps build the show's setting. By creating such a fierce contrast between the wealthy in King's Landing and those in less extravagant situations (Arya and The Hound without wealth, Bran on the run [does he know he's in danger?], and Stannis on his island after his failed siege), it helped assist in making Cersei's demand to feed the dogs in place of the poor as an even more despicable act, begins to place more importance on food (and there is no doubt that as Winter looms this will become even more important if the situation beyond the Wall is any indication), further emphasize the current power (and sense of victory) of the Lannisters, and also creates a sense of delusion among the wealthy, and powerful, in Westeros. While everybody claps cheerfully at the banquet to Margaery's exclamation, they're at the royal wedding, what sort of hunger do they know, and more importantly, what have they ever done to help ease the situation for the poor? The show tends to have a tight focus on the wealthy in Westeros and I must admit that aside from Margaery's actions in the previous season I can barely recall a single individual of note working for the betterment of those less-off, and even then her actions were motivated by a desire to improve Joffrey's image (and thus her own) and lessen the likelihood of a rebellion. It's almost fitting how delusional those in power are, however, given the White Walker's are looming and everybody was (I guess they still are really) obsessed with the 'war of the five kings'.
On a more focused note, the wedding scenes themselves were quite wonderful. The building of tension by the introduction of all those with a feud or source of conflict with the Lannisters, the internal arguments among the family, the cuts between them, the discomfort of both families as they sit separately (I know this is probably common at a wedding but I still enjoyed the lack of mingling at the table with the other family to create a sense of separation) at the table, and the rising sources of conflict (Brienne and Cersei, Loras and Jamie, the Obrenne exchange, Margaery and Cersei, Brienne and Joffrey [and at the same time, Margaery and Joffrey], the mockery of the war, and Tyrion and Joffrey) was all quite wonderful. I have to say that the episodes which focus on a single location have been some of my favourites of the show; it's a shame they're so rare even if it's perfectly understandable as to why.
In a more general sense, currently my least favourite characters' arcs are Bran, Jon Snow, and Daenerys, with the King's Landing plotlines, Arya, and Stannis (in particular). I'm not a particular fan of the supernatural elements which is primarily why the North doesn't yet appeal to me, I do like the religious conflict that exists in the world (primarily the suggested conflict between the Tree Gods and Lord of Light hinted at by the conflict between light and dark) but despite it appearing like the primary threat of the series I just cannot get behind it as it plays out, to me, as a very mystery-driven set of storylines (Why can Bran Warg and what makes him so powerful [Hodor[? Why him in particular? What do his visions mean? What must Bran do? Why did he get visions from the tree? What is the significance of the three-eyed Raven? etc.) which doesn't have the greatest appeal to me. While it could be argued the religious aspect is similar, I disagree, as I prefer the conflict between 'appearance versus reality' (which feels to me like the most significant theme in the show, that or 'power', with the importance of spies, distinguishing rumour from reality, the visions, the religious aspects, the effect that personal opinion has on the recording of history [the cause of Robert's Rebellion in particular], the air of distrust, true alliances versus feigned alliances, partnership, etc.), and one's interpretation of events, in addition to the potential malleability one can possess when subjected to potential sources of power and whether it is legitimate, to what I feel is a rather shallow story in the North, featuring characters I don't find particularly compelling (Jon Snow's arc last season made me invested in the "Wildling versus Crows" conflict, or at least more than I had been, but I still find the more grand plot concerning it uninteresting, and find both Jon and Bran quite bland). It has me somewhat concerned with Melissandre's implication that Stannis should head there considering I very much enjoy his character while also liking the conflict between Melisasandre, Davos, Stannis, his daughter, and his wife, but I'm hopeful it'll work should he go (if not though, I won't shed a tear). Daenerys seems pretty clear to be an end-game event (either invading before Winter arrives, and then her and any remaining individuals are faced with the threat from the North, or invading after and left to tackle a much fiercer foe than she anticipated) but I am finding her plot increasingly frustrating. Surely she is in a position right now to invade Westeros; she has three dragons, she has lieutenants, she has an army, and presumably she has wealth? I can understand why she's become side-tracked by her current vendetta against slavery but I must admit it feels like she's being dragged from A to B to C to D so that, eventually, the plot elsewhere is ready for her to invade. Hopefully this happens sooner rather than later as I'm growing increasingly tired of the stalling; I know longer find her personal arc compelling (she was my favourite in the first season) in isolation and without it having a greater impact on Westeros (or vice versa) I can't imagine it'll be long before my interest wanes on what currently feels like a spin-off series, contained within the main series. With more time dedicated to her, perhaps this would be more compelling, but given that the show has so many characters to juggle and it simply cannot afford to do this, it is admittedly beginning to feel like a shallower story to me than the rest of what is occurring (with the exception of the primary happenings of the North [that is, the White Walker/Bran related events, the Wildlings aspect I somewhat enjoy]) without a least some reason to develop further intrigue. So far (being concise and probably unfairly summarising), all we've been shown of Daenerys is that she's extremely well meaning, doesn't particularly understand the lay of the land, is somewhat naive, somewhat stubborn, very trusting, open to seduction, slightly hypocritical, set to defy cultural norms, and would probably be a good ruler, if she was able to deliver what she currently intends; there just isn't enough of a sustained conflict to develop upon this, either a personal conflict, a struggle between her desires and the actuality of the situation (this is where I think they may go eventually, corrupting her morals by presenting her with a situation where she must break her 'code' to rule), or something more substantial. It increases the scope of the world, but, currently I feel like she doesn't have any sizeable conflict or arc, isn't posing very many interesting questions or thoughts, particularly in comparison to her first season's arc. It isn't something the show can ignore, assuming she will become a very important part of the story later, but her snails-paced development into a competent ruler isn't particularly compelling itself. I guess, really, I just don't enjoy moments which seem designed simply to move somebody from one position to another, without making that compelling in its own right; I can understand that this may just be a constraint of the medium though, given how vast the cast is ("The Wire may have had a similarly expansive scope, but it wasn't as confined as this is with the source material).