In MoP, my guildemates (we did heroic/mythic) and me too liked to run lfr because they could practice (before flex raid), their (our) OP gear made it fun to just roflstomp stuff. (Remember tanks dps on Iron Juggernaut? That was crazy) I think mop's LFR difficulty was fine. It's like nowadays normal I suppose? I used it to gear alts. Drop rate was ok effort/yield wise, legendary cloak stuff dropped there. It was fine.
In WoD, I kinda remember not getting too much loot anymore (I guess "tourist mode" means "please don't expect gear here for this amount of effort" as well ) and in Legion even less (LFR for transmog purposes), and it was pointless even, when world quests gave equal or better. That is when I stopped doing or caring for LFR altogether.
I don't even know what is in LFR nowadays. I should check.
In any case, LFR raiders don't neccessarily want to get better, and it's fine for LFR. People who join just to be toxic... are just toxic, no matter the setting probably.