Game of the year for me is between this and Mass Effect, but I really expect Mass Effect won't deliver on the whole huge open Universe thing and when that doesn't happen then this has my vote already.
Even if SMG was back to the level of quality of Mario 64, it's still a derivative sequel to a game I've already played so I'll like it a lot but can't put it ahead of a brand new game. Same thing when considering Ratchet and Clank.
I dunno enough about Uncharted yet to consider it, but Half Life 2 will also go up there probably along with ME and Bioshock.
Anyway, my opinion of the game? Amazing.
Amazing vocal acting.
Amazing music, atmosphere.
Amazing characters for the most part.
One of the best looking games I have ever seen.
The world of rapture was totally believable and huge for an FPS (so much to explore outside of the main quest path).
The small touches in the game, the little details were superb. Everything from the musical starting menu (if you go up and down on that menu it makes a certain tune) to the little instruction videos on the plasmids to the announcements over the speakers, everything just so well done. A real living apocalyptic world and in an FPS, unbelievable.
The negative points (Very few):
The ending was crappy, the boss fight unsatisfying, should not exits (the fight that is not the ending :P)
The whole vita chamber revival system, I hated it. Why couldn't they just make it checkpoints and if you die you have to redo something. Takes some challenge out of the game.
Lots of minor glitches here and there like textures appearing and disappearing, and bodies going crazy and lots of slowdown in the last few levels (way too much in the last 2 areas) but nothing that would effect the game too much overall.
That's about all I can think of, only 3 flaws in the whole game.
Also, I really hope that when they make the sequel it has literally nothing to do with this one thematically and is a completely different setting and story. I really don't want them to ruin Rapture by making a sequel where you are some other guy out to get your character from this game or something like that. That would be fuckin terrible.
I would prefer if they didn't have a sequel at all, but I thought about it and they can keep the Bioshock title and add a number 2 to it yet make it a completely different setting and it would still work and I hope that's what they do. Don't ruin this for me :P