From what I've heard, he's been tremendously disappointing. He was only selected in the first round because that draft was remarkably weak at the QB position. Aaron Rodgers would be a third round pick in this year's draft. He might even be lower.
They didn't score very much in either the run game or the passing game. Their OL is fine. When you have Brad Johnson and Tavaris Jackson at QB, you don't have to play a deep ball.