My biggest issue is the unavoidable US centrism. Again, much better than what's out there, but it's absolutely real. Real talk gets stuck down immediately for being inflammatory
I've noticed that I have to shy away from certain ways of expression when I say things critical of a US-positive narrative. I have to avoid "real talk" as it were. It's kinda frustrating because that's how I prefer to speak but I can also see a difference in the discussion that ensues.
I feel you though. It can be pretty tough when you say something genuinely concerning, which people don't like thinking about, only to have it dismissed with the downvote button. Still, oftentimes such things gain more points while I'm sleeping and seemingly people in other parts of the world view my comments (which I think is kinda telling; it's what it is).
(For context, I am a born US citizen.)
For example I have posted and debated a little about my counter-narrative opinions on "the covid response" here before and had them stay and even gather the occasional upvote, to their credit. But it is also extremely easy to get moderated when walking that line, and likely highly dependent on whether or not the users participating or reading the comments become upset by what they see. This is not just a case of covid in general being an off topic or controversial issue, because you could post until the cows come home about the Covid response if you were cheerleading and parroting the schizophrenic and ever-changing position of western governments and media.
I give them credit at least, I think what they have is better than a lot of places for such debate. You just have to know your place and be extremely careful and polite and factual when you deviate, and you have to be prepared at some point the conversation will be shut down if it is upsetting and angering other users.
I also like that deleted comments can be made visible, another really good transparent part about the moderation. I do agree there is a lot of junk, but it's nice to see what's verboten. I assume posts can be nuked entirely with no trace , I give the benefit of the doubt and hope that's used sparingly.