Honestly, aside from a few bugs, glitches, camera angle, control and AI issues here and there, this game has really, really impressed me. More than any other in a long time. I'm not even a huge Assassins Creed fan, but this one has totally knocked me back.
I feel it's quite different from the others. Far more diverse, rich, narrative driven and atmospheric. The cities, forests, ships, seas, mountains, docks, weather with seasons et all. Just dripping with style and character. Add to that, the side games, hunting, missions etc, just keeps it all mixed up.
It feels like the GTA San Andreas of Assassin's Creed games. Detailed, gritty and bustling city areas, but then other areas that are open, beautiful, full of vista's and exploration. I'm a bit scared of heights, but holy shit has some of the climbing and jumping around left me breathless. Not the building or city streets climbing, but the mountains, the tree's, the landscapes. Some of the stuff you pull off is just sheer insanity, and the way they blend it all together works very well. Also love that segment where you're climbing a tower to glide down to the penthouse. Just gorgeous, and at the same time terrifying.
I have no idea how long I've got left, but I hope it keeps on giving.