Reddit is mostly just today's iteration of similar online forums that have been around for decades. They simply have different names.
Slashdot, Tumblr, Usenet, whatever.
If you choose wisely, there are some decent subreddits.
Unsurprisingly, Reddit as a whole looks a lot like the Web from twenty years ago. Heavily young white American/European male.
Some subreddits are so white that I feel like I'm attending a bluegrass music festival.