The fandom, especially the subreddit, has a lot of negative groupthink for anything but ATLA, kinda like the hardcore Star Wars trilogy fans. I don’t think that represents the net view of LoK, as it was very different as it premiered, and general sentiment like IMDB seems to skew much higher.
It does make me worry for Seven Havens' reception, as the setting/lore is an even more radical departure. There’s going to be tons of nitpicking/peeling apart.