You have to respect the year-in, year-out production that Randy Moss, T.O. and Marvin Harrison (why is he always left out of consideration of the top receivers) provide while always being double teamed, and somtimes triple teamed. They are head and shoulders above all other wideouts in this league.
Chad Johnson is not in their class in terms of production (just review the stats, folks - it's pretty clear). The first year he scores 15 TDS will be the first for him. The other receivers I mentioned have done it multiple times.
He's a legitimate #1 receiver, but a more accurate comp. would be with Hines Ward, Andre Johnson, Eric Moulds or Joe Horn. Those players are high quality receivers that really help their team. That is what Chad Johnson does. He should be happy with that. He is not a great one.