I gotta go with Joe Horn. He was putting up better numbers than the diva WR's of his time but never got a pro bowl or any attention at all from the MSM until that stupid phone stunt and then it wasn't exactly good attention. I think Colston to some degree also was underrated but my problem with Marques is he had his dropsy spells periodically where his hands turned to bricks. Joe was much more consistent IMO.