Just finished it, 100% done.
Overall I enjoyed the game but there were definitely aspects that bothered me. Most of all were the glitches, the dual-holster one being the primary one.
My biggest complaint is Conner's personality. As the story went on I found myself simply wanting his part to be over so I could be done with him and get back to Desmond (more on that later). I think him being a native-American is what did it for me. Not because of his race per se, but because of his views and knowledge of the world he had based on his tribe and an old, failed assassin. He just seemed too naive at times and didn't fit the idea I've had hammered into my head of what a major assassin should be like. The best I can compare it to is my view towards Niko in GTA:IV, where he doesn't fit the character type for GTA games. This isn't a problem with the game by any means. As I said, he acted like a native-American, which is great, because that's what he is.
I will say I loved his skills and the additions Ubi made to the fighting. It did feel a little too easy at times and the 100% sync was pretty easy. I had trouble with three, but once I realized the strategy of it I had absolutely zero trouble. I guess I should be happy of that, though, as I completed it on an Xbox Live account that isn't even mine, so it's not like I was getting a trophy for it or anything.
As far as the end goes:
I hope I got all that out correctly. I've been up since pretty dang early and staying up on coffee so I could finish the game before I had to hand the system back over.