I can honestly say I have nothing bad to say about this game!
Having just now, completed it for the 3rd time (earning my platinum trophy) I am still wanting more action in rapture.
The atmosphere of this game is like nothing else you will have ever experienced, the sound & visuals portray perfectly a fallen utopia, corrupted by greed and the thirst for power. Rapture has history, which is something most game worlds do not. Throughout the game there are 120+ audio diaries to collect, you don't have too, but listening to them really gives you an insight into many events leading up to the fall of rapture, sometimes they are so disturbing you wish you hadn't have heard them as the game get you emotionally evolved, for example, you walk into one room and see a serverly maimed women dead on a bed, there are tools all over the floor and alot of blood and guts, under the bed there is a diary, when i listened to it I realised it was my mother, my mouth fell open! for a second, I actually beleived this WAS my mother, this was the most sureal experience i've ever had in a video game!
The gameplay is equally impressive, with 6 main weapons to chose from, each with many ammo types your never short of new ways to blow away the crazy enemies, plasmids (genetic modifications) are also used offensively (and defensivly) to inflict more hurt on your foes.
This probably isn't a very good review, just take my advice and buy the game!