I've watched a lot of shows and movies, and played a lot of games as well. I also hear the term "overrated" thrown around for things like Sonic the Hedgehog, World of Warcraft, Avatar(The Movie, not Last Airbender), My Little Pony, etc. But the main thing I've noticed about all things called "overrated" is that they generally contain anthropomorphized animals or non-human characters. Like, I hear World of Warcraft and Elder Scrolls being called overrated, but I never EVER hear about Monster Hunter, which is a game who's goodguy roster is pretty much excluded to humans, being an overrated game. Another thing I've noticed is that games or shows with anthropomorphized villains, like One Piece or Gurren Lagann or The World Ends With You, can also not be called overrated. And, on another note, movies like Avatar can be called "uncreative" when the thousand of generic alien or zombie movies cannot be called uncreative. Sometimes I feel Avatar is only "overrated" because most humans are too prideful in their own species that they think humans are perfect (except for those awful, animal-loving scum bags).
But worst of all, I feel that things are only "overrated" if I like them. There are so many things I honestly do not like. Gurren Lagann, TWEWY, Monster Hunter, One Piece, Resident Evil, and also Mario, all things I strongly do not like that people basically think are unhateable. Sometimes I wonder if that's becoming a trend with the human race, that only things involving animals can be considered overrated, yet things where animals are villains are unhateable.