It’s my favorite one. It starts off poorly, but then you see that view of Damascus, and then Acre and Jerusalem, man I love that game so much. Plus it isn’t padded out with busywork either. You just do a couple of quick activities, and do one of the 9 assassinations in the game. Each of the 9 is different and unique and fun, and happens in a different district in the 3 cities. So each of the 9 sections of the game features a different, new location, it features vantage points to climb, new places to explore, and then a unique assassination. This doesn’t happen again in any Assassin’s Creed. The whole game is tight, taking place over 11 hours of gameplay or so. Whereas Assassin’s Creed 2 starts the trend of taking the same area of open world space and filling it with dozens and dozens of hours of similar activity instead of the nice terse gameplay in the original.
Now, with that said, my second favorite is Assassin’s Creed Brotherhood, which managed to fill Rome with over 120 hours of really good gameplay. Unlike Assassin’s Creed 2, the routes around the city were really well designed, the parkour was more fun, the assassinations were more fun, everything was better.
(In Assassin’s Creed 2’s defense, the last 20 hours of AC2 are very good, it’s just the first 80 hours I had a problem with. The last district you unlock in AC2 in Venice is finally well designed, the unique makeover of the city for festivals is inspired, and the story becomes a lot more interesting too. But I wish I didn’t have to suffer 80 hours of sheer boredom to finally get to that good part).