I have to go with Clapton as the most overrated. Again, he's great, but the title is overrated.
For me personally, I think he was def a trailblazer in the mid to late 60s. Rock music wouldn't be what is it without Cream, Blind Faith, Yardbirds & JM & BB. However, when he made a conscious decision to go back to a blues purist route, he became one of the most boring of the greats.
It's interesting too because I have a family member that has been a musician in working bands for almost 3 decades and we've had this conversation before with lots and lots of guitarists, and this seems to be a common opinion among guitarists. They certainly respect him but the term 'boring' has come up many times.