So this is just no objectively based on fact
If I remember correctly (and someone do correct me) our offense was only above the national average in 2011 (when they were 28, which is quite good admittedly). Every other year we have been a below average offense in McCall's tenure.
If someone can post the actual numbers, that would help, but it's been on here before. This myth that Mick has been respectable, or was once good and has just stagnated recently is just a myth. The offense has always been frustrating, even with some of our favorite players like Persa and Siemian/Colter/Mark.
I will say this, we have had some flukey seasons, but I don't feel like we ever recovered from the loss against OSU in 2012. That team was damn good, and it felt like in the same way that Thorson's freshman year team was winning despite not being all that great, that team kept losing despite being damn good. Back then we would take care of non-conference play without question, and destroy inferior opponents (think syracuse that year).
So no, I don't think Mick was every above average, I think he had a nice season or two, but a this point we need a shakeup.