I think there’s some sort of unwritten rule that says “if you are a serious movie dude, you are not allowed to like Ben Stiller”. Which is fair enough if you consider some of his particularly excruciating catalogue, which I would say is merely one step above Adam Sandler but Adam Sandler had the good sense to stop churning out movies a little while back (possibly because the funding was no longer forthcoming, but that’s neither here nor there).
Thing is, Ben Stiller can sometimes have a rare comedic gift. He can be an oyster, distilling the excrement of the universe into a pearl of a movie, furnishing it with lashings of Robert Downey Jr. being a genius, and generally having a good time. There’s no room for a bad movie in here because it is, generally speaking, too fun: even if you hate Ben Stiller or Jack Black (although why you’d hate Jack Black for any reason other than his role in I Still Know What You Did Last Summer, I’ll never know), this is pretty worthwhile! It’s not even stupid funny like Zoolander, which … oh God, is there any point in doing “comparative comedy”? Probably not. I was going to go into a massive detour into Will Ferrell there.
The point of the matter is that Tropic Thunder is a pretty dang funny meta-adventure into the world of film making, the vanity of “serious” actors, and the ruthlessness of studio executives. Some of it is too gross-out for my tastes, and there’s at least two nonsense dance scenes, but it’s ultimately worthwhile.