I believe I can objectively demonstrate that, at least in my experience, Japanese Language provides a much more negative experience than many, if not all, other Stack Exchange sites.
I belong to 33 different Stack Exchange sites, of which I've participated in asking at least some questions or giving answers on about 28 of them over the last 4 years. After Japanese Language, some of my most active sites are AskUbuntu, Stack Overflow, Android Enthusiasts, and English Language & Usage.
On AskUbuntu, I've asked 157 questions, and given 26 answers, and received 2 downvotes. (My reputation on AskUbuntu stays low because I give away a lot of bounties. Also, I have one "unaccept" - I don't know what that is). On Stack Overflow, I've asked 128 questions, and given 13 answers. 4 downvotes. Android Enthusiasts, 59 questions, 17 answers, 1 downvote. English Language & Usage, 13 Questions, 6 answers, 0 downvotes.
Now, compare that to Japanese Language, where I've got 171 questions, 90 answers, and 34 downvotes. 9 of those are in the last few months, as it appears the negativity is increasing.
You might say that my downvotes are higher here simply as a function of being more active here. But, if we take the amount of input I've given (questions + answers), and take the downvotes as a percentage, we see that Japanese Language is still five to ten times higher than anywhere else. For AskUbuntu the percentage of downvotes to input is 1%. Stack Overflow - 2%, Android Enthusiasts - 1%, English Language & Usage - 0%. For Japanese Language, it's 13%.
The nature of the downvoting is also very different here. For example, the only question of mine to get downvoted on Science Fiction & Fantasy received 3 downvotes and was closed. There was a lot of immediate commentary and discussion, so I knew exactly what was wrong with the question. In that circumstance, I don't mind having a question downvoted or closed, because I know what's going on. I'm only human, I make mistakes.
But on Japanese Language, the downvotes come spread out over time, for questions that have been asked ages ago, with no explanation. Here on Japanese Language, negativity falls like snow, gently, constantly, building up over time.
In fact, this is why I bring this up now. I've not been that active on Japanese Language for a while, but I still use other Stack Exchange sites, and it feels not uncommon to see in my inbox of reputation changes something like this (taken today):
These are questions I've asked years ago, and someone is downvoting them now. This never happens with other sites. Quite the opposite - with other Stack Exchange sites, the only time I've had a reputation change on a question months or years after the fact was when it was upvoted.
No explanations are offered, of course. And while I might be able to see controversy in some of my input, the downvoting is often outright inexplicable. I just can't imagine any logic that could justify why a question like this one is not right for this site. It's a straightforward grammar question, with a straightforward answer. On other Stack Exchange sites, far more egregious questions or answers simply get ignored.
Perhaps it's just one person going around sprinkling downvotes everywhere. Perhaps it's just happening to me. Perhaps it's many people. Whatever the case, though, the moderators should be doing more to foster a less negative environment. No one person should be left to rampantly downvote, no one person should be targeted, no Stack Exchange community as a whole should be given a platform for pervasive and unexplained negative feedback.
Anyway, this is why I don't use Japanese Language as much as I used to, even though I'm still very active on the Stack Exchange network over all. Japanese Language is, as I believe I've shown, demonstrably more negative than other Stack Exchange networks, and for that reason, something isn't working here. Which is a shame, because it could be a much better resource.
I hope maybe something can be done to make the experience here more in line with the other Stack Exchange sites, and I leave it to the moderators and community to work out what that might be, or even if they want to address it. In the meantime, I sincerely (no, really) wish good luck to all of you with your Japanese study, and thanks to those who have provided help and support.