Allow me to offer a more balanced evaluation.
Fisher attempted to fix the OLine by acquiring Jake Long and Scott Wells. Unfortunately, their health (and that of Saffold) was unreliable. He was also not the only person that thought GRob would be a great LT. We have the benefit of hindsight (even if I preferred Matthews). Without a healthy OLine—very few offenses thrive. Consider the decline of the Cowboys offense.
Secondly, Bradford had good production when he was healthy and SJax was formidable as well under Fisher. I’m not sure many offenses are built to be productive when their starting QB is removed.
Finally, Sean McVay didn’t build this team by himself. Several pieces were already in place so can we give JF just a little credit here? If we criticize him for GRob, shouldn’t we also praise him for getting Aaron Donald when the DLine wasn’t a weakness? And, BTW, Austin on the jet sweep (a McVay staple) started its effectiveness during Gurley’s first year when Gurley started hot so at least we can credit that staff for one good wrinkle.
But these are the only apologies I have for him. When opposing defenders openly discuss the ability to diagnose plays before the snap of the ball something is wrong. Worse yet, when even I can call them from my TV set...then it’s tragically bad. Furthermore, when your entire 21 year NFL coaching career regularly features less than average offenses...there are no other explanations beyond that fact.
I think this is fair.
I don't think anyone's saying he did not do a fair amount of things well. Not sure about this, but didn't he bring in Fassell as well?
Like you said, it was the offense... but, more importantly, what appeared to be a flat out refusal to bring in a talented offensive coaching staff. I mean, it went from mediocre to downright silly.
Started with Schottenheimer who wasn't really that bad, when compared to:
Cignetti
Boras
If there weren't more qualified candidates when he selected Cignetti and Boras, I'd understand. But there were plenty better and little to no effort was made to nail one down.
He had numerous opportunities to do exactly what McVay has done:
Admit he needs serious help on a side of the ball that he really is not expert in.
It wasted two years. Sorry if I'm still upset over that... it was, IMO, avoidable - as proven by what we are seeing this year. Granted, a few very nice tweaks were made this off-season, but it could be argued that, had Fisher hired good offensive minds, maybe those pieces would have been put in place back in 2015).