He was amusing in Ferris Bueller's Day Off, personable and quick-witted on Win Ben Stein's Money, but I was a bit disappointed in him when I heard about his antiscientific "documentary", Expelled: No Intelligence Allowed. And I lost quite a bit of respect for him when I read this: Six Things about Expelled Ben Stein Doesn't Want You to Know.
I guess he wants to be the Michael Moore of the Right.