Well, he has led the Chargers to the playoffs 4 out of the 5 years he has been the starter. He is consistently one of the top 3 rated passers in the league. He makes the pro bowl every year. He played in the AFC Championship game on a torn ACL. Last season he threw for over 4500 yards with practice squad players around him.
Guy is a flat out winner. Its too bad he can't play defense and special teams.