Asklemmy

Mods having their own personal, perverted interpretation of the rules (or interpretation of your post)

No easy, transparent way to review their decisions.

Not having appropriate tools to detect and mod auto-generated or repetitive content submitted by companies trying to influence public opinion.

Upside-down text for comments/replies with even the vaguest connection to Australia. Also, the "everything in Australia will kill you" meme has been done to death...

I say don't try. One of the problems askreddit and other subs like showerthoughts had was that you had to follow an extremely restrictive set of posting guidelines to even have your post stay up.

I think we're better off just letting the community upvote/downvote to maintain quality, rather than trusting powermods.

Karma bots for reselling accounts

Asking for upvotes in the title, e.g. "upvote if you think..."

Subreddits called news that only shows news from a single perspective. Sure if users only upvote a single perspective that's fine but mods shouldn't remove things they don't like if it's news.

Headlines that don't match the article. That always ends in rage baiting.

The toxic behaviour found in a lot of subreddits. Its an inevitable thing that it brews in communities or instances, but it'd be nice if Lemmy held itself above repeating the patterns of the lowest common denominedditor.

Negativity. It's ok to criticize, but there was something about Reddit that encouraged people to bash each others until one side wins instead of agreeing to disagree and move on.

mistaking dialectal differences for bad grammar

Posting for the sake of posting, this decreases the quality of posts significantly. Let's say there's a new meme trending, what would happen on Reddit (and other social media) is subs would be filled with uninteresting slight variations of the same meme. I'm not against memes, but we also should pay attention to whether what we are posting is minimally interesting, useful or meaningful. Lemmy does not have a "recommended", "trending" or "hot" feed, so this should help significantly in this regard.