Well... judging from the demo, this is a really intense and cinematic game. Like Zrow said, once you got to the top of the water after the plane crash, I was wondering why I wasn't moving. I moved the analog stick. Then I actually moved and my jaw dropped.
Graphically this is really awesome. The water is second only to Crysis IMO. The art style makes the game *looking out from a clear tunnel into the sea full of neon-lit buildings is impeccable. Having water drip down, having lights flicker, having the shadows create an eerie mood, having the Fallout-esque signs, movies, and the like... it really creates a unique atmosphere.
Gameplay wise, it's excellent as well. The plasmids are great, lighting someone on fire and shooting electricity into a pool that several enemies are in are both very satisfying. The way the revolver and machine gun shoot, as well has the way your controller rumbles when doing that, makes your weapons feel very distinct. This isn't like many other games where a rifle, a pistol, and a machine gun feel the same.
I guess my only disappointment was that jumping down into water and shooting your pistol in it doesn't look as realistic and good as the water itself, but that's about it.
I think BioShock is a definite Game of the Year contender, all the way up with Super Mario Galaxy, Mass Effect, and Halo 3. We're going to look back at 2007 a few years from now and remember this game.
Still, I can't help but wonder why I'm paying $50 a year for XBL and MS can't keep up with the user demand for a game like Bioshock.
Since when did you buy another 360?
But I do agree why the heck am I paying $50 a year? At the very least, make the freeloaders (Silver members) wait a week or add some more servers. Or both. I love the fact that we get surprise demos on Sunday nights, but please, let me actually download it.
Heaven forbid the Halo 3 demo comes out in XBL crashes (again). The world will literally explode.
Like Gears of War, there won't be a Halo 3 demo because there's no incentive. Everyone will buy it anyway.