Star Wars has nothing on Twilight here.
Twilight books are simple, telling a sometimes enjoyable story, but are generally very weak attempts at literature. Not worth the hype it got, picking up all those lost Harry Potter fans looking for the next big thing.
The films are nothing short of awful, and I'd rather watch The Phantom Menace 5 times in a row than have a Twilight Marathon.
So... most overrated? Not even close.