Aaaaand it's over. It might have been 8 years since Camelot made an RPG, but they haven't lost anything. They haven't really improved all that much either though.
Liked:
Graphics - On the whole these really did look quite nice - especially the summons, I always looked forward to getting new ones and made sure to try them out in battle right away. There tended to be quite a bit of pixellation when the camera zoomed in, but taken as a whole the new artstyle was quite nice. It won me over in the end.
Battle system - Pretty much the same as the originals' - so if you liked it there, you'll like it here. Nice and quick, with all the usual Djinn and summons to play around with.
Encounter rate - If anything this leans a little on the low side, but personally I thought it was perfect that way. Between this and the general briskness of the battles I never became frustrated or annoyed.
Music - On par with the rest of the series, the music is on the whole pretty good, especially the battle themes. Some of the area themes are good too, although there are a fair few forgettable themes so on the whole it's not something you'll want to listen to a huge amount outside of the game. Works quite well in it though.
Story - While it's not exactly revolutionary stuff, I thought the story was decent enough to keep your attention throughout, and did a good job of linking in to the old games. It also felt decently paced, in comparison to TLA where the plot seemed to disappear for half the game.
Psynergy - Out of battle psynergy was a nice mix of old and new, as a new installment of Golden Sun should be. Some new ways to use the old ones that do return as well.
Puzzles - Just as enjoyable as ever, although they didn't feel as challenging as those in TLA, though there were a few where I did have to stop and think. Somewhere between the two originals in terms of difficulty - so while I did enjoy them, I'd prefer the next game's to be a little harder.
Length - To do everything without a guide could run you somewhere between 30 and 35 hours, which for a Golden Sun game is a really nice length. Long enough to feel satisfying but doesn't overstay its welcome.
Extra content - Fair few extras and things to find - plenty of Djinn (9 for each character), hidden summons, optional bosses, subquests and extra events, etc.
Weapon Proficiency System - While it could really be expanded on, the idea of becoming proficient in various weapon types and getting multiple unleashes for them is a good one.
The Encyclopedia Feature - While the volume of information here did have a habit of getting a bit overwhelming at times, it was still nice to have it to browse through, and allowing you to access encyclopedia entries by clicking key words and names in the dialogue was a pretty useful addition. Although if you want to complete all the entries you're going to have to click red underlined new entries whether you want to read them or not.
Additions to the Djinn system - In the same way as the above there's now a Djinn-dex of sorts which shows little profiles of every new Djinn you get, which is quite a nice addition as well. Even better is how each Djinni has a unique appearance that you can see in the Djinn menu, which I was really pleasantly surprised by.
Feels like Golden Sun - For better or worse, the game really feels like a Golden Sun game - obviously there's the fact the main characters are the original cast's descendents, but all the mentions of the old cast, returning to some of the old towns 30 years on, the return of classic items and psynergy buffed up for the DS were great too.
Neutral:
The characters - The cast was a mixed bag, but I can't really say any of them were particularly interesting or memorable. Other than Garet's son for the sheer fact he is really annoying, and I wanted someone to punch him.
Didn't like:
Items management - All the joys of getting your inventory full of useless items from the originals, made worse by all your items being displayed in a line so you don't know how many slots are left. Got old really quickly.
Difficulty level - Way, way too easy. At least TLA had a couple of bosses that gave me a bit of a challenge, even if I never died against them. The only reason I know what DD's Game Over screen looks like is because I accidentally wandered into an optional dungeon and ran into its boss completely unprepared.
The emoticons system - Entirely pointless, you'll pretty much just go for either happy or angry half the time, and it makes no difference to the story at all. I did find it funny how despite not saying anything, quite a few times another party member would pretty much just repeat what you 'said' straight after anyway, and even with the addition of the emoticon system, odd questions are back. My favourite was "Who disturbs my slumber?" "Yes/No"
Too much talking, too little said - Yep, not much has changed on the dialogue front. Lots and lots of dialogue, with lots of things being repeated, and a few occasions where they feel every single party member has to respond to a situation despite the fact that they really have nothing to add.
So yeah, in short it's a new Golden Sun game, for better and for worse. I find it hard to imagine anyone who loved the previous entries won't love this though.