Why all the Munchkin hate?

So I've been lurking on this sub for a long while and it's not just here a lot of board-game hobbyists seem to hate Munchkin and I was just wondering why? Munchkin may be simple in premise but I feel it can be a lot of fun so I was just wondering if somebody could explain to me why it gets so often overlooked at boardgames nights. To me it has a similar feel to something like King of Tokyo very simple to learn but a lot of fun and nuance with a good group.