Vinny B regularly points out how McVay does things (and praises them), versus how Fisher did things (and lets the results speak for themselves). He doesn't bad mouth Fisher; doesn't have to.
I'm not sure I would have used this word even a couple of months ago; but with what is being reported (nearly universally), what the players are saying, and the personnel moves by the FO, I'd say Fisher had become not far from incompetent to Coach a modern NFL team.