I enjoy the immersion and feeling of being a badass assassin in AC2 time period, but I really can't get myself to enjoy the story. I want to, but I get lost with all the conspiracies, all the different assassination target etc. I don't remember any of the target in AC2 and end up having to force myself to beat it, and with the wtf ending, I just get even more lost.
I actually have Brotherhood on steam, but when I tried to play a little bit at the beginning, I just don't care much about the story, and the novelty of being badass assassin in that period wear off a little after AC2.
AC3 time period really interest me until the bad impression on neogaf so that's why I skip it.