Like the Mass Effect series, Deus Ex: Human Revolution is an 'immersive simulation', with a wonderfully realized world full of people to interact with, where player choice is instrumental in the storyline. The great thing about the game is that you really can play how you like, and you aren't punished for changing your mind.

Deus Ex: Human Revolution can be played stealthily, or aggressively, and you can mix up your style as you feel fit. Your actions and words have an effect on how the story plays out, which not only feels great when you're playing but gives the game plenty of replay value.