I know/feel/surmise that Bo is a less than average coach at this point in his career based upon reasonable observations
Do you, like...
.....
know what the word average means?
Sure. the average team (the typical team, in the middle of curve --- the 40th-60th percentile or so of a data set in imprecise measures --- the average team in D1 does not have the magnitude of problems manifest that NU has in terms of turnovers, penalties (specifically delay of game, procedure penalties), degree of confusion on the line of scrimmage, inability to adapt to game situations to stop the bleeding (60+ points, gashed over and over by the same formation, same plays), etc. Since these particular observables are largely coaching related, it is reasonable to assert that Bo is below average at this point. If one chooses a different reference set... not all D1 programs but just the B1G coaches, Bo is slightly below average there too. I am certainly not alone in this assessment.--- the authors of the article felt this as well. And there are others too. Plenty of them.
I don't know. I think you are grasping at straws calling the team and/or coach below average. Say what you will about blowout losses. But he has been the better coach in the game far more times than he hasn't.
Bo is an above-average coach in August/September (18-3) - he wins the winnable non-con games, losing one or two he likely should have (or definately could have) won. Losing to VT twice in hard fought battles, but laying an egg against UCLA last year.
Bo is an average coach in October (12-7) - he drops a game he should win (Iowa St., Texas) and only once in 5 years won a game he probably shouldn't have (Missouri 10'). Pretty ho-hum month for Husker fans.
Bo is an above-average coach in November (16-4) - he usually gets it done and gives the fan a little hope going into post season.
Bo is a very below-average coach in December (2-6: 0-5 last 3 years) - he loses games he's winning, gets blown out of others, and since 2009 Arizona...hasn't really shown up for one yet. December is a rough month for Husker fans.
Bo is a below-average coach against ranked teams (5-14). He fails to step up and win the big games that can turn the program around.
Bo is an above-average coach against unranked teams (46-6). He, and this team, are exactly what you'd expect from a #25 ranked team. We lose most of the games to ranked teams...winning a few against the bottom of the ranking. And we lose the same amount to unranked teams.
If you want to statistically lay out every BCS coach and put it purely to wins/losses my guess is he falls somewhere around #10-12. If you look at his entire body of work - there's certainly a pretty good argument that's he's right about where his team is every year....#25.
(cfbstats.com if you are after my numbers)