[Woofles]

/r/neutralpolitics - It's not necessarily trying to be completely neutral, but it's trying to be factual and requires sources to be posted.

/r/christianity usually has fairly high quality comments and conversations among Christians and non-Christians.

/r/netsec has high quality posts and comments.

/r/hockeyplayers has a very helpful community but probably not of interest if you're not a hockey player.

/r/goodyearwelt has awesome reviews and information about high quality footwear

/r/malefashionadvice is one of the better run larger subreddits that has writers from major publications that post and comment

/r/askhistorians is very heavily moderated which means a lot of the most interesting questions remain unanswered for a long time, but the answers that are provided are very well thought out and sourced

/r/asksocialscience is similar to /r/askhistorians just different content