Keena Young is, IMO, maybe the most under-rated and under-appreciated player of the past 24 years. It is a hard thing to measure because you have to decide how good the player really was and then guess at how "rated" or "appreciated" they are.
But Keena was the MWC Conference Player of the Year. How many POY's have we had? Of those, how are the considered/rated? He was also an honorable mention AA by the AP.