Bioshock demo

People are going nuts about Bioshock but I don't think I'll be one of them right now, at least not at full price. Oh it looks great of course and some people put some loving detail into the environment to capture the 50s vibe of overtly happy white people with a hint of drab on the underside, but since you're crawling around in dark corridors using robots to help you fight, how is that different from Doom 3? At least Doom 3 gave you a flashlight. To its credit Bioshock gives you lightning and fire from your hands so there is that. Otherwise though the game, to me at least, seems to be like the movies Sky Captain and 20,000 Leagues Under the Sea raped Doom 3 and from that was a baby named Bioshock.