Speaking of Dustin Hoffman, there's a very good article about Ben Stiller in the current New Yorker, with references to other actors. At the end of "The Contender," David Denby writes:
And he [Stiller] should relax and stop glaring at the camera like a cornered animal. Dustin Hoffman played an uncomfortable young lover, sixties style, in "The Graduate," then kept growing as an actor. Now, in "Meet the Fockers," he's a joyous, dancing clown, completely at ease in his aging but superb flesh. For an actor about to hit forty, that's a spiritual victory worth imitating."