I should point out that I really really love Assassin's Creed games, I played the first 3 times for achievements and stuff, and I could just run around the rooftops for a week constantly, and I have to go with Kantor on this one
Assassin's Creed 1 had a brilliant concept, but it was so appallingly designed in so many ways. The mission structure was just diabolical, go to a city, find viewpoints, sit on a bench and then go and kill the target... Finding the viewpoints was good, but the whole thing was so repetitive and the story was rather dull. There was NO variety. There are also other things, such as the lack of the ability to just run around the game later, or any side missions what so ever and the twist was amazingly obvious
AC II just did everything right from the first one. It kept the fundamentally great concept, but then added a great story, variety and pretty much everything that you could want. Brotherhood was just more of the same, but still brilliant, especially with your own Assassin's
AC I was still a good game, but it should have been so much better, and that is what Assassin's Creed II was, with another interesting setting (the only thing AC III needs to be brilliant)
