un·der·rate [uhn-der-reyt] verb (used with object), -rat·ed, -rat·ing. to rate or evaluate too low; underestimate. The vast vast majority of the US population doesn't even know who the guy is. To be ignorant to a man's existence is to underestimate him to the extreme.* And yet he's working on a pretty decent little season. He is therefore underrated. By definition. Indeed, he is a veritable paradigm of underrated-ness. I stand by my nomination. *Think Kobe when he pretended he didn't know who Jeremy Lin was.
He's definitely underrated, I just think there are plenty of other underrated guys who actually play defense.
Stephen Curry is slightly underrated, imo. He doesn't get much pub now, but I watched him live against Memphis, and he's pretty damn impressive. I think he had 38.