Not sure why you're so adamant about pooping in Frost's quality of play, but this was still in an era before quarterbacks started becoming the entire offense and putting up video game numbers. At the time he was only the 10th player to ever have a 1,000 yard passing and 1,000 yard rushing season.
Let's put it this way - most Nebraska fans think Tommie Frazier got robbed of the Heisman and is arguably/probably the greatest college quarterback of all time. Frost threw for pretty much the same amount of yards at the same completion percentage (8 less touchdowns), ran for 400 yards more and 5 more touchdowns than Tommie did.
He was a finalist for the Unitas and the O'Brien awards, and he played his best in the biggest games.