I think that's the rub right now. I think we all anticipated a long rebuilding process (hence the seven year contract). Frost wanted some safety net in place. And make no mistake - we all probably agree that getting things turned around at Nebraska was not going to happen overnight. I just don't think we anticipated it to look like this, and quite frankly, I don't think there are many good reasons for it to look like this right now.
To your point, the historically "great" coaches usually got things kicked off fast. And that's what a lot of us hoped for and wanted. Dabo is a good example of someone who perhaps took a little bit longer, but even then, his early teams didn't look like this over a three year period.
The quarterbacks have at best plateaued, penalties are still a problem, fundamentals are still a problem. About the only two objectively good things I can say right now is that I think the raw talent is pretty good and that the team does look like it is faster/stronger than it has been, probably dating back to Bo's years. But, none of that is translating to consistency or wins.