Just beat the game.
Its alright, but definitely not the best of the series. It feels a lot more simplified, the level design for missions has taken a huge nosedive imo as well. Conner just isn't a good protagonist, and considering he's a native american during that period of time you'd think they'd make a better effort out of it. While I do heavily enjoy the wilderness in this game, the cities are much worse than in previous games. Which as much as some would hate me for saying this I think the setting is the weakest of the series as well, I love american history but they didn't exactly use it as well as they could have. Great concept, lukewarm execution.
It's still a good game, but definitely my least favorite so far. Oh and you guys thought the Mass Effect 3 ending was bad? AC3's ending is straight up horrible, enough to have you wondering what the hell they were thinking as the credits roll. Considering how Altair and Ezio had the two best endings for any videogame characters ever in Revelations, I was severely disappointed.