There's been a few places that I've been unimpressed, problems assassinating even when nearly on top of a target, guards getting stuck in places and their legs wobbling* or their guns floating, and people's mouths being glued shut etc.
Early on in the game a thief steals an apple (or some other red spherical object) while you're walking alongside somebody, naturally I chased after, but when he got around the bend he just stopped and walked away, leaving the red sphere floating in mid air.
Being able to hide in thin foliage right next to enemies is a bit ridiculous too.
It is growing on me however, even if I can't for the life of me understand how to combo kills, I seem to only be able to do it a fraction of the time.
*Sequence 2 spoilers