Let's get this over with quickly: "Gentlemen Broncos" is absolutely awful.
Don't pay money to see it, don't waste your time if it comes on cable; you might not even want to bother reading the rest of this review.
It's that bad.
The only positive associated with the film may be that it likely marks the end of the Jared Hess era, Jared Hess being the fellow who came up with the indie sensation "Napoleon Dynamite" in 2004. Since then he has worked his amateurish non-magic on the terrible "Nacho Libre" and now this.
The idea seems to be that you use mostly awful actors, put them in embarrassing situations, make everyone look generally stupid and lay some poop jokes on top of everything. With "Napoleon Dynamite," the results were somewhat awkwardly funny. Since then, the results have been downright embarrassing for all involved.
Surprisingly, some decent people are abused here -- Michael Angarano, Sam Rockwell, Jennifer Coolidge, Mike White, Jemaine Clement. The results are still embarrassing.
Angarano ("Sky High") plays Benjamin, a youngster in a small town who writes bad science fiction. After he enters one of his books in a writing contest, it is stolen by a onetime successful author (Clement) who turns it into a hit even as a smalltime video company in Benjamin's hometown is making it into the worst movie ever.
The audience is privileged to see this worst movie ever (starring Rockwell), which doesn't look all that much different than "Gentlemen Broncos." Lots of testicle jokes. Ha!
"Gentlemen Broncos" stumbles into a few funny moments, but as a general rule this is an absolute waste of screen space.