I like the Assassin's Creed series, but the games are just so alike that you are really just paying for the story. There is only so much free running around Common Era Europe that one can do before it becomes tedious.
I've been really into my Gamebryo games as of late, played Skyrim intensively for a month before picking up Fallout: New Vegas and exhausting the game. I'm now onto Fallout 3, which I enjoy more than NV, despite there being less quests and character personality options (the faction stuff in NV made a lot of the game).
I'm not too fussed about Dawnguard, mainly because I've bored myself of Skyrim something silly! I'm anxiously awaiting the Square-Enix announcement that Final Fantasy XIII-3 is going ahead. (and a bonus if XV is announced as a regular console RPG and not another fucking MMO that fails to deliver all that it promises!)