Brotherhood is more like Assassins Creed 2.5. The gameplay has not really changed and the story starts the exact second where AC2 ended. I completed Brotherhood last night and it was enjoyable but it felt like an expansion pack rather than a new game. There are still bugs remaining from AC2 which can be frustrating but not enough to stop me playing. I tried the online game but the target kept changing after ten or 15 seconds so it was just annoying.