Nope.
It was okay up until ACII. Nothing special, but basically functional.
Then I unlocked the first "Truth" video.
"Hm, two naked humans, male and female, displaying unusual agility while running through what I think was a futuristic garden of some sort. Well, they're clearly Adam and Eve, but why the futuristic stuff?"
"Oh hell, they're going to pull the whole humans-are-an-alien-science-experiment thing. Well, crap."
"Nah, have some faith. They're better than that. The story has been alright so far. Maybe this is a red herring."
*many hours pass*
"Son of a *****."
And Brotherhood added bugger all. I barely remember what happened in that game. Just Ezio seeing the sights in Rome and Desmond royally screwing the pooch. It's like they had a level that they didn't manage to fit into ACII, then decided to stuff it with filler and turn it into its own game. (EDIT: I just realised that I'm very nearly quoting Yahtzee there. Still true though.)