A revolutionary game worthy of the title "modern classic", this game deserves props not just for being innovative, but for being so ridiculously fun. The opening plane crash and subsequent descent into Rapture is an experience unparalleled by anything else. From there, the fun begins. Beating people with the wrench is fun, but it's not until you gain your first plasmid that the real excitement begins.
Player choice is a heavy factor in this game, as illustrated by the bevy of weapons and plasmids at your disposal. Do you freeze your enemies and hit them with the wrench, or do you hack a security turret and set it loose upon your enemies? The choice is yours. Along with this, players will have a choice to either harvest or rescue the Little Sisters (the little girls that run around with the Big Daddies). Each choice has it's own advantages and disadvantages, so the player is left with quite the dilemma.
Needless to say, the fights with the Big Daddies are some of the most intense sequences in video games. This, coupled with the incredibly entertaining gameplay options make this one of the best games of this generation, if not of all time.