Ok, lets start. Bioshock is a first person shooter, where you explore the underwater city called Rapture.
Shooting fire and lightning from your fingers and eviscerating your enemies with various weapons. What more could you want?
I had a couple of moments when running back and forth for objectives felt like a frustrating pain in the ass and I just had to take some time off the game, but still despite those points, it's a great game.
Now... I must say... I can mostly agree with the reviews and glorifications about this game. This game truely is awesome and the story is quite long and interesting. The game occupies a quite large portion of your time to complete, but about 80-90% of the time it is totally worth it. Now yes, it technically has replay value, because it has 2 different endings, but it wasn't that good, in my oppinion, to deserve a second playthrough. Maybe later, in the future. Who knows.