One common critique/defense of Bronco has to do with the talent he's working with.
So, I ran some numbers. This is a list of Coaches Winning Percentages with their current program (minimum 2 years), crossed with the programs' recruiting rank (avg over 5 years):
http://1drv.ms/1VDSswQ
It's not perfect numbers, but it's the best I could dig up in an afternoon on the internets, and it at least brings some data to the conversation.
The #2 guy may surprise you