Statistically he's actually been one of the best QB's in the league since we beat them. He's not a bad QB in the right system. He's average and his contract is average.
After the trade he will cost about $25.5m. That puts him around 14th in APY.
The only vets below him in APY are Brady, Carr and Big Ben (just). He's actually one of the lowest paid starting vet QB's in the league. Everyone else is either on a rookie deal or a placeholder like Dalton or Cam.