I am going to have to assume that he earned it, because they sure as heck don't give them away to any Joe Blow despite your claim. Sure, maybe he has a very odd way of interpreting things, and maybe is not the sharpest knife in the drawer, but pretty clearly he must have had enough ability and drive to earn that degree. Hard work can compensate for lesser abilities, to a certain extent.
I don't know how you can judge whether he deserves his degree or not. I know I can't. I can judge his overall character and intelligence, but that does not affect his past work. I do not think he is below average in intelligence.