LOL, besides one, they were all low-drafted QB's with low expectations. Busst? Hardly, unless of course you have extremely high expectations for a 5th, 6th, 7th round selection.
Colt McCoy will thrive in the NFL, it's made for QB's like him. Smart, Accurate, Mobile. I don't know about Bradford (I think he'll be fine), but McCoy will be a great NFL QB. Better then Stafford at least. Who has a slim chance at actually reviving the Lions franchise. Of course, you probably thought Joey Harrington was going to be amazing too, huh?
Big 12 > Pac 10 & Longhorns > Trojans
By the way, the Pac 10 is loaded with way more QB busts. Ryan Leaf? Joey Harrington? Akili Smith? Cade McCown? Yeah.
The Pac 10 did also provide some all-time greats. But saying McCoy, Freeman, and Bradford will be busts, because "Big 12 QB's are full of fail" makes you seem retarded.
Especially considering some of the all-time busts come from... the Pac 10!