Finally played this game (picked it up cheaply at the local video store) and I had a very good first impression. I really like the feel of the freerunning and combat. The potential problems I see so far are the frame rate and maybe the slow pacing of the game, but otherwise it's currently a thumbs up from me.
I wasnt expecting this game to turn out as well as it did, but they did really well with the climbing and combat mechanics. Just like soyle im waiting for the sequel to come out so I can get back to the assassination goodness