Weber is not a winner, and that's pretty much all there is to say. Some QB's are just 'winners' who either by talent or force of will can lift their teams to victory, while others are unable to do that, and Weber falls squarely into that second camp. I see him as kind of like the Jon Kitna of college football, in that sometimes he can look quite good or even great and leave you wondering..."Dang, this guy looks good! Why hasn't he had more success?", but the answer is because just like Kitna, Weber's not a winner. He just doesn't have that inherent quality within himself. I mean he can sparkle like a diamond in garbage time when his team is already hopelessly behind and the game out of reach, but that's not exactly what we're looking for.
I had high hopes for him too, especially after his freshman season. At one time he looked pretty talented, but being jerked around the way he's been what with the different coordinators and changes in offensive philosophy on an almost yearly basis, it's not such a big wonder that he's not really progressed.