Hitman.
Okay, I have to say, from the point of purely level design, damn they have the best of Hitman developed. It's back to to the good old days of some glorious multiple option levels with lots of pathways and effects you can push to finish things.
The trouble is, storywise it's kind of sucky in that there's nothing there to really sink your teeth into yet. You get that training level which is the whole "20 years earlier" style of 47 joining the ICA, then the rather funky and cool montage sequence of time passing and references to previous Hitman games, and then the Paris level which, again, on level terms is rather damn good. But you don't get that much feel for an overall story beginning yet.