Three other films spring to mind that Broncos reminds me of in the sense that they all bring similar elements; absurdist story structure, over-the-top character-acting, and an unapologetic bevy of immature, toilet-ish, sometimes abstract humor.
What I can't think of is two people other than me that actually enjoy this kind of film a lot. And I'm guessing you can't either. That's why I think these kinds of films do badly. It breaks down like this;
- 10%; people who even knew this was coming out - 5%; of those people saw it - 2.5%; of those people liked it - 90% of everybody else doesn't care - 100% of those people who didn't care would probably hate this worse than could possibly be imagined.
If you disagree and love this film, see box office receipts for, and then watch; Land of the Lost, Freddy Got Fingered, and UHF. Not only are they three excellent movies in a similar vein, but they all bombed beyond oblivion for the same reason.