Most of the things that I like are that.
Well, not really, because nowadays everything has a handful of fans, but I take pride in going after obscure works.
It's not that I hate the mainstream, it's not exactly worse than what I consume, but it still makes my eye roll when people are gushing about how this or that movie is the best thing ever, while really it's only special virtue is that it's themes were tolerable enough for millions of viewers' common denominator.
I especially prefer whole mediums and genres that are generated by non-commercial hobby artists, such as webcomics and web graphics novels, fanfiction (the publishable-novel-quality type, not the interchargible wish fulfillment ones), online serialized novels, or fan-translated works unpublished in the west, like manga and visual novels.
Some of my current favorites include:
Worm [http://parahumans.wordpress.com/category/stories-arcs-1-10/arc-1-gestation/1-01/] (Completed Web Serial) Kind of a dark superhero story with lots of escalation.
The 1632 series [http://www.goodreads.com/series/85018-1632-universe] of novels. Historical time travel adventure and politics. Not that obscure, but I'm a proportionally huge fan of it.
Legend of the Galactic Heroes [Legend of the Galactic Heroes], the anime. Epic space opera with political intrigue.
The Alexandra Quick series [https://www.fanfiction.net/s/3964606/1/Alexandra-Quick-and-the-Thorn-Circle] that are technically Harry Potter fanfiction even though they are more of a separate stories with other characters, settings, and plots. Better than canon, not that it contradicts it.