One thing I'm noticing about the Assassin's Creed series as I go through it again is that the Assassins got kind of boring after AC Revelations. Not the concept, or the style, or anything like that... I just mean the characters themselves.
In AC3 they were nonexistent until Connor brings them back (and Connor himself was a bore anyway), and in ACIV they're a bunch of island-dwelling tribal folk with no personality or humor.
The worst thing is, these two games came right after Revelations, which features possibly my favorite Assassin in the whole series (aside from Ezio): Yusuf Tazim.
A lively, sarcastic badass who seems to laughingly enjoy his business of stabbing Templars and tossing explosives. Such a fun, likable character to have around.
They need more characters like this in the AC series. Hell, he ought to have his own game as far as I'm concerned.