Monk was one of the best of his era. I believe he was second all time in receptions when he retired. He is currently 6th all time in receptions and 11th in receiving yards (Irvin is 20th and 14th). Irvin made the Pro Bowl 5 times, Monk 3 times. Irvin also had the advantage of playing with Aikman, Smith, Moose, Harper, Novacek, and one of the best O-lines in NFL history.
Theismann raves about Monk him too.