The control is in the normal game situations often a nuisance because inputs are converted by the game just is not clean. Correct control is frustrating whenever you have to perform tasks very fast and clean reactions require (eg. Tracking another person shipment. A very short amount of time allowed, etc.), because the character often makes what she wants and jumps eg be a pursuit through various obstacles at a time in a completely wrong direction, although it has not moved at the stick in that direction, etc. shall be hanged then again at the individual tasks that are actually just had, by the controller but an ordeal ,
Why the control has been implemented so sloppy absolutely incomprehensible, in similar games from the principle Games like Uncharted 2 or Batman Arkham Asylum klappts also.
The sake of completeness to note that AC Brotherhood the steering is better. The manufacturer has probably noticed that AC II was not the big hit on this point ...