Look at the important Qb statistics. Compare Carr's 3rd season with any of the top QBs in the NFL and he compares very favorably. Here are some stats that tell the story:
yards per attempt: David Carr 7.6
Int per attempt: David Carr 0.03
All other statistics have built-in fallacies. For instance, someone in the west coast system should have a higher comp % than someone who throws the ball downfield a lot. Also, some teams prefer to throw the ball inside the 5 yard line, so that boosts the QBs TD numbers a great deal. McNabb's statistics are a great example of that.
Anyway, if you compare Carr's 3rd season with Steve McNair, Donovan McNabb, Mike Vick, Peyton Manning, Trent Green, Chad Pennington, Dante Culpepper, Bret Favre, Tom Brady, in their 3rd season..
Carr (7.6)ranks 2nd behind Peyton Manning (7.7)in Y/att. Nobody else is even close to those two.
Carr ranks 4th in fewest INT/att:
1. Brady
2. McNabb
3. Manning
So, among the top Qbs in today's NFL, when Carr went back to pass he was more successful than any of those QBs except for Peyton Manning, and, at the same time, was in the top half of that group in taking care of the ball... When you factor in that Manning, Brady, Culpepper, McNabb all had a much stronger supporting cast- I think it indicates that he is at least on an excellent developmental track.