This is just my anecdotal experience as an outsider, but the volume of nonsense coming out of lemmy.world dwarfs anything coming out of any other server. Three separate times this week I have had groups of people from there aggressively telling me some kind of total gibberish. I thought about defederating rss.ponder.cat from them, just on general principle to encourage people to go elsewhere and improve the overall cultural quality of the network.
I can't speak to sh.itjust.works, to me they seem fine. lemm.ee I've never had an issue with. lemmy.world is just a nonstop fountain of drama and ridiculousness, though. Deliberately hosting and making a home base for UniversalMonk for months, for example, I will never understand.