I've blasted my way through Assassin's Creed II, Brotherhood and Revelations and loved all three of them.
I'm now onto Assassin's Creed III and kind of hate it, not least because they make the Kanien'kehá:ka/Mohawk character run around in deep snow without snowshoes, which is absolutely asinine as a concept, since snowshoes were developed by basically all snowy climate Turtle Island and Inuit peoples for some time before the FN character's part of the game takes place (1783).