You can make stats say whatever you want them to say. You would need to look at recruiting rankings, player development, draft picks, won/loss %, quality of opponent, etc. You can't just say "well look at his conference win/loss % and his salary".....
Petrino's ACC record is 21-11.
Of those 21 wins - 13 of them (13-3 vs those 3 teams) are against - Wake, BC, Syracuse and UVA..
The combined conference record of the ACC opponents he beat in:
2017 - 9-23
2016 - 16-32
2015 - 9-31
2014 - 12-28
He has never beaten an ACC opponent that has a winning conference record.
He's 1-10 vs ranked opponents, 1-3 in bowls, lost to UK as a 4 touchdown favorite and has lost to Wake, BC, Houston and UVA while favored.
Nearly all of those stats were also compiled while having the best player in college football and one of the most dynamic talents of the last 30 years.
I'm not trumpeting for his removal or to be on the hot-seat just yet. But I am saying that the idea that some fans could be entertaining the idea of Brohm isn't far fetched right now. He hasn't set the world on the fire since his return.