Grindhouse's trailers were done to keep in tone of the "Grindhouse" feel of the movie. Tropic Thunder's were done to establish the characters and the absurdity of Hollywood.
Big differences between the two.
Yes, I'm quite aware of the point, thank you. You're right, though, that there was a big difference between the fake trailers in Grindhouse
and those in Tropic Thunder
: the ones in Grindhouse
were actually interesting, whereas the ones in Tropic Thunder
merely made me wish the movie proper would hurry up and start. I would've much preferred more media coverage, interviews, etc., of the actors in order to establish the characters, instead of the yawn-inducing trailers.