well, i got this game a couple of days ago and thought i would put some impressions in in case anyone cares. there is some slowdown at times to the point where your character is hovering instead of running, but its mostly a visual problem as the game still plays fine. there even seems to be slowdown in the cutscenes that appear in between missions, but i think it might be intentional. my major problem with the game is that it takes 59 blocks to save a single game file, which is ridiculous in my opinion. the control does take a little while to adjust to, but it may be that i just dont play too many games that use a dual analog scheme. you do have to stop in the midst of gunfire and pull up a menu to change your weapon which gets frustrating though.
but despite those few problems, i have been completely addicted to this game since i got it. you do truly feel like a hitman going through the levels, and the variety of ways to take out your target adds to that experience. once i got used to the controls, they work very well. the game is quite difficult too, with stealth being a nessessity to get through most of the levels. i'm only seven missions into the game, but i would definately recomend it to anyone who likes these sorts of games.