Pretty open-ended question. For example ...
How do we know if the forum (Jp.SE) is rejecting simple translation questions too much, and thereby being un-inviting to newcomers?
https://meta.stackexchange.com/search?q=unfriendly
Q: Why does Stack Exchange have to feel so unfriendly now?
What are some really-unfriendly forums? I want to go and check them out. Thank you.
Is there a stat page showing rankings of, e.g., downvoter-infestation? -- ( = crawling with Dorito-breathed nerds, creeps & meanies )
Why is the Japanese Language Stack Exchange site so negative?
(Feb. 2015) > In aggregate, Japanese.SE is solidly middle-of-the-pack when it comes to downvotes cast: we we have a upvote-to-downvote ratio of 24.7 (on posts other than community wikis), which gives us the 88th-highest ratio out of 136 SE sites.
"solidly middle-of-the-pack" --- That's surprising ... it seems pretty friendly now. Maybe it's gotten better.