Does a non-mainstream film have to be pretentious? I don't like overly pretentious, obscure films either but then again I don't watch 99% of current releases, and even most of the "must see" blockbusters I wait for the DVD and watch it at home in peace and quiet for a fraction of the cost I'll happily watch a black and white war film with hammy acting and terrible special effects if the story is gripping, or a classic spaghetti western with overdubbed dialogue and then equally happily put something more accessible like The Expendables on. I watch a lot of old cold war era science fiction films but most of those are truly terrible. Most of my movie collection is older films, though.
I recently watched most of the Kurosawa series on Film 4. A lot of people would probably say that was pretentious just because they are foriegn language films but if you can get past the language issue then the stories are just as good as anything produced in the west.
Films are like wine, I guess. People can claim to be experts on it, but in the end it just comes down to what you like.
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I think I saw that one on PornHub