Just finally got around to buying this (yeah, still stuck on PS3). BEAUTIFUL scenery in the North Atlantic sections. That's my kind of nature.
I'm not too far into it though. I usually forget about the story missions until I fukk around and discover all the locations. I like it so far. I've noticed a few bugs (but EVERY AC game has had them), the most notable being the damn game froze on me after I completed a mission.

So far it's only happened once, but it was only my 2nd or 3rd time playing the game, so I was pretty pissed.