There is one, and only one way to measure a NFL player.
Does his play measure up to his pay?
I would say that similar to James Carpenter, Bruce Irvin, Byron Maxwell, etc., etc., Paul Richardson is well worth his rookie deal. He provides depth, contributes as part of the rotation, and doesn't break the bank. No he isn't a bust because he isn't expensive, but if he wants a raise, he will have to show more. Fortunately for Richardson, he still has time to do it, however, every game he is not noticeably contributing, his next contract is taking a hit.
The big question is.........what kind of money will his agent demand when his rookie deal expires? He might come cheap, while having time to hone his craft and develop chemistry with Wilson.
You don't write off players because they are not all stars. You write off players because their production does not match their salary demands, or keep pace with the league minimum salary, or can be easily approximated by a cheaper rookie deal.
People have to learn that a roster of all stars is expensive and unsustainable. What you are looking for is "value relative to salary" for the purpose of supplementing a core group of All Pros.