Prolly cuz it sucks to play outside of the free-run mechanics....the engine was great but the execution was awful..the same mission like 32 times...only differing when u get to the actual target.
I will say that I perhaps enjoyed the monolouges the most in AC1 though...that shyt was TOUGH.
But yeah....ACII fukkin crushed the buildings. Better protagonist, better cities, better assassinations, the truth puzzles and all that...
ACII imo is one of the best adventure games ever