That's a tough one. Just because something is popular doesn't necessarily mean it's highly rated- I know plenty of people that religiously watch Dr Who, but we all agree that the last few series especially are deeply, deeply flawed.
Something that I really do think is overrated is The Beatles- their early stuff to be precise. Their later, experimental, weird stuff really is that amazing. But I just don't think their early stuff is anything special and I'm not sure it was at the time either. They were just one of many bands that happened to be a bit catchier and a bit cuter and so they were the biggest, and people forget about all those other bands.
Something that I really do think is overrated is The Beatles- their early stuff to be precise. Their later, experimental, weird stuff really is that amazing. But I just don't think their early stuff is anything special and I'm not sure it was at the time either. They were just one of many bands that happened to be a bit catchier and a bit cuter and so they were the biggest, and people forget about all those other bands.