3: ****ing Epic 2: This got me hooked to the story. Brotherhood: MOAAAR EZIO!!! WOOHHH. Combat got better and faster. 1: Played this first. Loved the story. Revelations: Still a good game, just not the best.
AC3 i love the setting. Its one of my favorite historical time periods, also the weapons, location, and missions are really fun and it has a lot of content.
ACB - Its really close. Rome was amazing, loved the return of Ezio and the continutaiton of the story. Cool side missions and alot to do. Small improvments keep it ahead of AC2.
AC2 - Really overhauled AC. Ezio was great, the cities were great, so many improvements overall.
ACR- Really enjoyed this one. Still had great gameplay, cool city, bombmaking was great and had great set pieces. Den Defense and notoriety keeps it a bit lower.
AC1- The free running, graphics, and story amazed me at the time, i remember seeing my first city,Damascus, for the first time, it was amazing. The combat and repetition, keeps it down last though i still had fun with the game.