AC Revelations while not as good as AC II was FAR BETTER than Brotherhood!
I have to strongly disagree. Istanbul was a poorly realized city, and even including the second 'city' in the game, Revelations had easily the smallest game world of any game in the franchise. It was also a less interesting world in that it didn't have the variety of II's cities or even Rome in Brotherhood. Moreover, even more so than in Brotherhood, it was obvious they could not advance the story too much, because it would interfere with Assassin's Creed III's story. On top of that, mission design (with a few good exceptions) was poorer, combat was easier yet again, they messed with the control scheme and removed its logic (by putting the terrible bomb system under Y, which should be using your head), the tower defence sequences are terrible, and the first person platforming sequences were not well realized.
There were obviously positive aspects, like it being set outside of Italy, there being some good platforming levels yet again and Ezio's and Altaïr's storylines getting fitting endings, but on the whole, I felt it a disappointing entry in what is otherwise a very enjoyable, if shallow, franchise.