You mean other than porn, right? Because porn compilations are not only a goldmine for ratio (since they are almost always freeleech), but they are a goldmine for my peenor as well if I find one that suits my interests.
You know, now that I try to actually think of a serious answer, I can't. If I rule out TV series, music discographies, and porn, the only ones left are typically Various Artist compilations and things like that 100 Mindfuck movies you mentioned. And I almost never download any of those because I am not only picky about the formats and qualities I download that many movies/songs in, but I also typically download specifically what I want. If it happens to be in a pack like that and nowhere else, I'll probably just download that file out of the pack. Oh yeah, same thing with books now too. I have downloaded several mega torrents of books, but for the most part they sit there untouched because they are terribly formatted or there are thousands of books I don't want to take the time to sort through. So now I just download the ones I want.
It seems I'm not really much of a compilation person I guess, so I'm gonna have to stick with porn.