Nobody has mentioned r/anime_titties yet. It's easily one of the best I was a part of when I was still on Reddit. Everyone had different opinions and viewpoints and things stayed very neutral. Even the mods preferred to comment on potentially shady links rather than delete them.

And no, this isn't a troll; it's one of those reverse-name subreddits.

Yep, it's one of the best subreddits around, commenters just need to keep in mind their rules of civil discourse.

r/NeutralPolitics/ used to be good for discussion as well due to heavy moderation including requiring sources for claims. I've not read it in quite a while though.