Huge communities, "karma farming", accusations of "powermodding", etc have never been the attraction of Reddit for me. Many changes to Reddit over the past year or so affect these types of communities most.

Reddit still shines brightest with small communities, largely less than 100 000 members and certainly no more than half a million. The tiniest, with between ten and a thousand members, can be some of the friendliest and least controversial communities on the internet without turning into constant echo chambers.

I guess they're also the communities that stay as close as possible to the platform's roots.