So after putting 10 hours into the game I think I am struck with a case of, it's ok.
From a technical standpoint it's easily a step up from brawl, with much better mechanics and overall feeling. I am looking forward to getting more special movies and playing around with characters.
From a content standpoint it's a mixed bag though. Roster size is obviously fine (though screw parity the ice climbers should be in the wiiu version), as is soundtrack stages and what not.... but the non straight up matches stuff leaves me rather disappointed.
The barebonesness of just classic and all star mode leaves me quite empty and disappointed when I think back to melee's adventure mode and brawl's subspace. I was looking forward to seeing what new mode they would have to top those, but instead they just allow co op in the old modes.
The events are alright, but the difficulty is all over the place in the co op ones. Some of the later events takes very little effort to get the rewards, while some of the early ones feel nearly impossible to get at this time. Beyond that I was hoping for more of them. it's not like they put a ton of effort in them so they could have easily cranked out way more of them.
Tour mode... is an ok distraction I guess, but it feels barely thought out, just kind of thrown together, and over all isn't very satisfying at all. The only reason at all I am remotely interested in playing it is because I can do it as an alternative to grining classic and all star to get moves/parts... beyond that I don't think I would touch it again.
As for 8 player smash, in general it's a good addition, and it's not nearly as chaotic as I expected.... but the lack of at least 6 team colors is a tragedy that they need to fix in an update soon. with 8 players I obviously had less experienced players playing, and even with handicap on they never stood a chance and had problems adjusting. I would have loved to stick just the new players on their own team but I couldn't because it would mean I would have to team up good players as well which would just give them an unfair advantage even if i teamed up the two worst of the good players. I also wish that the random map selection wasn't locked behind getting all of the maps as a couple of the levels were so bad to play on that I had to turn everything to final destination mode just to avoid the garbage levels :/
Overall I think it's a fine game, and I do still need to try online play (which ideally I have the same smooth experience most of you have had) but overall I wish it had more wow factor to it... the feature that was most likely to do that (the customizable specials) really has just left me underwhelmed given the fact that you have to grind a 2 player mode or play smash tour in order to unlock more specials... I suppose there might be super rare drops in actual matches as well, but I was never really told what I picked up in matches. I also wish the amiibos had more of a role then CPU that quickly gets more difficult that you can toy around with a bit but really serves no real purpose that the normal cpu can't handle.
tl;dr: overall it's a good game, but I wish there had been more focus on the non match content, and thus has left me underwhelmed all together. I look forward to at some point playing with you guys some though.