First of all, the fanbase's desires don't apply to the process even a little bit. McDermott owns those decisions. It is a plain fact that Dorsey and Brady were handed their jobs without any kind of competition. Sham interview process is the exact right way to describe it.
Second of all, just speaking for myself here but I did not agree with those hires. My thought process for years has been that you have an elite QB in his prime, so you should have no shortage of experienced proven offensive minds banging on the door trying to re-ignite their careers.
It's possible McDermott could have struck gold with one of those hires and found his own version of Ben Johnson, but he didn't so now there is no reason to think he has an eye for offensive coaching acumen. Seems to me like he just made safe picks with people that he already knew he could work with, which kind of encapsulates his entire tenure here to be honest.