Al's NEVER a lazy actor, he's just had SO many quality roles, it became inevitable that would become a characiture of himself...and he did. In fact, I know the exact moment in time where it happened in his professional career.
The EXACT moment came during that monologue at the end of "The Devil's Advocate" back in 1997, then poof! Think about it, since then he does "Pacino 'doing Pacino'": Any Given Sunday, Two For the Money, likely Ocean's 13...
But, you can't say he's a lazy actor b/c look at the work he did for the HBO miniseries, "Angels in America"...he took home the golden globe for it, still proving he can go out on a limb when called to.