This game is cool, but some stuff aged terribly because the gameplay gimmicks are repetitive, I beat this game a year ago because I wanted to revisit, but I never want to play it again.
The story (Desmond's side) is only bad because I know it never went anywhere different that some boring conspiracy.
The story (Altair's side) is good, and Altair is a good protagonist. The rest of the characters are boring at worst and forgettable good at best.