Big ass image of the assassin's creed roster
I played AC and AC2. Not bothered to check out other games yet, but I will at some point, probably.
AC was quite decent, I liked the combat system and the setting (best choice ever), but the gameplay was getting very repetitive and boring after a while.
AC2 was a very nice improvement to 1, pretty much everything aside from combat system (and the setting, although the new one is about just as good or only slightly inferior) got better. The fighting went full retard both gameplay-wise and visually.