Nothing to do with Wolf Creek since I have not seen it but…
I liked * House of 1000 corpses* because I felt it was true horror. An idiot convinces his friends to go offroad and all sorts of bad shit happens in the backwoods. I can even imagine their being such houses in the remotes of the West where fucked up people do nothing but murder people. They are isolated wackjobs out to hurt others, pehaps because they were fucked up as a child. We see this on the news occasionally such as Jeffrey Dahmer. I’d imagine if he were in the backwoods like the Unabomber he might never have been caught.
Problem is, The Devil’s Rejects was just a continuation of more fucked-up-ness with no point beyond the same evil fucks killing more decent people for no reason. It was nothing more than Rob trying to show more inventive ways to kill people. Nothing about the characters is fleshed out beyond the dad issue. On the DVD there is a “special feature” showing a main character beat the fuck out of a tied-up cheerleader and presumably later rape her while she cries out and screams in in pain. After seeing it, I could figure out if it wasn’t some shit put in for sick fucks who dream about beating and raping women. It added zip to the movie. At that point I was wondering what the fuck happened to horror movies.