Wow...some serious Ezio hate going on here..
I rather liked AC2 and loved it a lot more than the first. I just hated all the freaking climbing in the first one and it seems that they took that to heart and made the 2nd one a lot better. The skills and better mix of gadgets was awesome about AC2. Brotherhood, so far as I'm not finished, is really good as well. I like that they changed the game play just a bit but still kept all the goodness of AC2. I especially love that you don't have to play through 3/4th of the game to get majority of the skills. You get the smoke bombs, gun (but no dual blade...what's up with that), crossbow (new), throwing knives, poison, and other stuff from the start (technically you have to buy the smoke bomb pouch after renovating a tailor shop but you get the drift).
But I'm actually waiting for the Desmond AC2...I mean, we get a taste of it at the very freaking end of AC2 and then a bigger taste during Brotherhood (again, not quite through with the game so I don't know how much) and he definitely needs his own game