Well after successfully completing Mirror's Edge on my 360, I can honestly say that this is the best game I have ever played!
It has amazing graphics, excellent controls. At first the "jump" button doesn't seem like the normal button, but soon it works perectly. I have even found myself using the same jump button in other games which use different buttons for "jump"! That's what happens though when you play a game for so long, the button functions are wired into your brain..
This game has a FPS perspective and you play someone who runs over rooftops and jumps off them etc.
If you like the premise, you should like the game.
Buy it. Test it. Play it, it's awesome!