Dude, I love you man, and I typically share your love for weirdly good shitty movies, but Slotherhouse was terrible! I chuckled a few times at the absolute ridiculousness of some of it, but it was just bad! Like, Cocaine Bear was better level of bad.
And they did something I didn't think was possible. They took a cast of like 10 or more young girls and somehow only had one even halfway decent looking one (the blonde in the tub). I feel like you'd have to go way out of your way as the casting director to pick non-hotties in that situation. If I were a legitimate studio casting person and put out a call for sorority-aged girls, I bet well more than half of them would be at least bordering on hot. Not that they were hideous, but there wasn't more than that one that I would even look twice at on the street. That has to be on purpose. The one butch lesbian's voice kept taking me out of the movie. WTF was that? It was like she was trying to do a Batman voice or something. And the mean girl looked like she was in her 30s. (I just looked her up, and she's 29, so I was close. Also, the headshots of all the girls make them look decently cute (even the lesbian), so with good lighting and makeup they can be pretty, but it's almost like they tried to make them ugly and blotchy on purpose. In today's society I wouldn't be surprised if that were actually the case to prove some sort of point or something.)
I could see it being rated higher than say 4/10 if you were stoned out of your gourd watching it, but since I wasn't, that's all it gets from me.