They see a guy with a 64% completion percentage average, 53 touchdowns vs just only 11 interceptions in his Junior/Senior year combined. All this in a pro style offense.
A guy with excellent pocket prescense, poise, accurancy, and has done great under pressure as well. Sure he may not have done well in a few games, but every quarterback has their off days. Matt Leinart was incredible quarterback in USC, and he will be great for the Arizona Cardinals, but he had a bunch of weapons around him that had picked up the slack for him at times.
Physical tools? You don't need to be an athletic quarterback to be a great quarterback in the NFL. Tom Brady, Peyton Manning, Carson Palmer - three of the best QB's in this league and they probably have less physical tools than Brady Quinn himself.
This guy is going to be great, and is more NFL ready than any of these quarterback's. Though Brohm will be a good one too, but I see him staying for his Senior year and going for the Heisman/National Championship if he doesn't get it this season. Even if he stays, I don't see him being picked first over Brady Quinn.