Not really. Good middle-brow, relatively low budget films do come out of the festival circuit (Cannes, Sundance, etc.) but to my mostly mid-brow eyes, there aren't a huge number of super obscure undiscovered gems hiding in corners and deserving films, even if they're fairly low budget, tend to percolate up.

I've long been a pretty avid film watcher, including of classic films, but my tastes are pretty mainstream. If you're looking for new views, I'd just suggest Googling using terms like "Most underappreciated science fiction films" and things like that. Some good channels on YouTube as well.