I've outlined my reasoning before and it's certainly not based on what someone else said about him (except for regarding intangibles).
You can first look at his athleticism. It's there to see.
Height: 6002
Weight: 191
40 Yrd Dash: 4.45
20 Yrd Dash: 2.53
10 Yrd Dash: 1.51
225 Lb. Bench Reps: 20
Vertical Jump: 35 1/2
Broad Jump: 10'08"
20 Yrd Shuttle: 4.08
3-Cone Drill: 7.07
Good Combine numbers (better in just about every respect than Mike Jenkins') and it's readily apparent on tape. Those numbers are well-rounded. Good 40 time, 3-cone, shuttle, and broad jump. There are no holes. It's not like others that put up a flashy 40 time and then have a sub-par broad jump or vertical. He's above average in nearly every respect.
Then you look at his production. It was top notch against top notch competition.
http://cowboyszone.com/forums/showthread.php?t=113512
His opponents' have a QB rating of 24.7, with a YPA of 3.5 and a 32% completion rate. Add to that that he has more INTs and PDs combined per pass attempt than every top corner in this draft class.
Then you look at the intangibles. His work ethic and his demeanor. And from everything I've read about this guy he is a class act. Sort of a T-new type work ethic.
I look at 3 areas when considering a draft prospect: (1) athleticism, (2) college production, and (3) attitude/demeanor.
He's by far the best combination of all three in this draft.