Well, War of the Roses was funny, and he played an asshole in it so it was palatable and fitting...the humor good largely due to it being a Danny Devito movie, of course. He does(did) have chemistry with Kathleen Turner, though, so carrying that into WotR and turning it around to a hate thing worked well.

Falling down was good because I liked the idea of the character just freaking out like that...but it could have been played by anyone.

It's been a while since I saw The China Syndrome. I wonder what I'd think of that performance?

I think we have thereby concluded that he's famous because of his dad, and who the hell knows why he's done better than his icky brothers.