Well, in reading this post makes me think of an entirely different kind of answer for the question at hand.
I would say EVERYONE !
Let me add another twist to this view: everyone thinks they are the most underrated player! This is because we're all a bit delusional about our own skills and overrate them by a mile. That's why you see amateurs throwing tantrums over missing balls that they are not even a favorite to make.
(This bias is not just in pool billiards, it shows up everywhere. Except of course for those who are depressed etc.)