Think it needs a little more oil
The problem's in the controls...mainly your aim. It needs more precision. I started out playing on 1400 x 900 and noticed that little mouse movements (and by little I mean I have a logitech G5 with the dpi and sensity turned all the way up) your crosshairs jump.....don't get me wrong it's not terrible....up until you get stuck with the sniper rifle in single player. I hope this is something that's fixed with the first patch....but then again I've thought the same about the last few rainbow six games and they still suffer from shaky mouse movements.
There's a few bugs....making the game feel rushed.....mainly in sound getting caught every now and again in between levels...and I noticed vehicle movement is a little choppy....do yourself a favor and wait a few months if your looking for a new first person shooter to pick up. Maybe it'll get fixed....if not maybe the price will drop.