Despite all those inexcusable mistakes, which merit replacement, the guy has patched together 8-8 teams despite having back to back seasons with collegiate level talent on the OL then on the DL, being the two most important position groups on the team after QB.
The offense is inconsistent and not good enough but statistically remains middle of the pack or better depending on the measurement.
So he's not doing the completely horrible job that a few posters in fantasy land want to pretend is the case. Not good enough, yes, worst coach in the league.... laughable. Don't forget, any other coach who would come here, would not be doing as well as they are doing wherever they are currently, due to the huge negative influence that is Jerry Jones as well, so it's not like Bruce Arians, who went 10-6 in Arizona this year, actually would have gone 10-6 if he was here.
The biggest joke is Deuce says "He's the third worst coach in the league" but then caveats that clearly false statement with "Ooops, not counting all the young coaches who were just hired this offseason or last offseason."
Well.... so he's not the third worst coach in the league then.