Pretty tough to pick but i would say AC2 for sure. I loved brotherhood and I personally think that AC2 and brotherhood were by far the best games from the series. Revalations I didnt mind, but I felt like they could have done more with the story. I hate the Ezio's story ends and the only thing I didnt like about revalltions was desmonds stupid sequences. I thought that was the most boring part of the game and took away what they did it previous ones.
1st on x360a to 1000 NHL 13
1st on x360a to 200 PACMAN CE DX (Win8)
1st on x360a to 1000 NBA JAM
2nd on x360a to 1000 NHL 11
126 completed games: 82 retail, 44 arcade