prosfilaes
Adventurer
Forgotten Realms gets flack for doing things a LOT of other settings do, to a greater or lesser degree. Lets take some of the classic criticisms leveled at it...
Yes, but you can say that about almost anything. The difference is always in what criticisms and saving graces matter to the person who is liking or disliking the thing. Also, of all the other settings you mention, only Golarion is an ongoing thing. You've got to hate Mystara pretty badly for it to matter, but FR is a big deal for anyone playing 5E.
Raistlin was literally killing Gods; take that Elminster!
Rastilin was confined to his own story arc and was a villain. The PCs were the driving power in the original DL adventure path with a world-changing ending, and could be so in any future stories.
Iuz says hi. Fizban would too if Paladine wasn't dead.
Likewise, it's easy to hate FR's Avatar era and not care as much about an single demigod or a Gandalf-style avatar.
In some cases, the feature may just be a problem in its FR form to the person; in some cases, the problem may just be a problem to the person, in any of its forms, it's just that FR was on the table at the time.