The gameplay is perfect, this is a shooter! And actions in the game quite realistic. Ex: if you knock out a guard but you leave it in the middle of the street, it alert the other guards who will find it, and you've got to run!
Another thing that I like the freedom that is available in the game. We can go almost anywhere in the city (mount on rooftops, through basements, go into houses, etc.). And better yet, we can choose our goals, track history, or follow Contracts different characters of the game. Or just your walk around the city quietly!
That's my feeling about this game: AU TOP!