Something I think a lot of people don't really grasp: Frost took over a MUCH better situation at UCF than he did at Nebraska. Things went totally off the rails in George O'Leary's winless final season at UCF, but that was still a team just two years removed from a Fiesta Bowl win and a top 10 finish. O'Leary built a pretty solid team, they just needed a little help getting back to where they should've been.
A lot of people only looked at that winless year (and not the years that preceded it) and thought Frost could pull off that kind of turnaround anywhere. Unfortunately, well, Mike Riley was a coach who never came anywhere near O'Leary's career achievements, and certainly not at Nebraska...