Yeah, the 90s were a good time for movies that could not have been mainstream in any other decade. I’d place Judge Dredd, Demolition Man and Total Recall in the same “corny, but excellent” league as the 5th Element.
Then you had unofficial double features of sorts: Smoke/ Blue In The Face, Casino/ Goodfellas.
12 Monkeys needs to be mentioned as well, it’s probably the most palatable movie on my list.
In the “disconcerting, but unforgettable” league, I’d place As Good As It Gets, The Crossing Guard and, of course, the grisly “8 mm.”
There are many forums like that, especially if you’re not limited to one language. Most of the ones I frequent have been around for 10 or 20 years or more, but kind of fly under the radar. ilxor being a very good example. AFAIK, the latter also adds only one new user per day. I’d say that’s a good thing, even though I had to apply several times.