I havent finished the game yet - SUPER close to though, but the only things that really pissed me off:
- Obtuse "Full Sync" goals, do yourself a favor and dont bother with these aside from the achievement
- Horrid stealth... or rather, horrid detection
- Levels that make you run from guards, except guards will run up to you ad bap you with their swords and fuck you up
- Too much following, not enough blending in/escort/full alert
When the game flows, its OMG CUM better than AC2, but then you hit a super low point and you just want to take a big greasy shit on it
Also I mentioned it earlier but the heaps on heaps of shit they make you do just to complete 1 goal (Borgia Towers)