I disagree. The assassination contracts in AC2 were the best. They added so many more of them in the DLCs too.
I agree that there wasn't enough sneaky assassin stuff in Revelations and AC3. They didn't even bother with the truth puzzles type stuff in the last one. You guys remember the puzzles from AC2? So awesome.
I might go back and play AC2 over again. I actually planned my honeymoon based on that game.