It's exactly that.
I can understand criticism of him for zonal marking and subs on a game to game basis. And yes, Iwobi coming on and Rondon staying on the pitch, baffling.
But conversely in other games he's made tremendous substitutions and changed the game. So it's not like he constantly makes daft decisions in that area.
No, what is happening is a desperate attempt to scramble around and pin everything on Benitez. Like we haven't just had one of the most accomplished managers in world football before him have exactly the same problem with this bunch of mutants we charitably call footballers in an Everton shirt.
We're 8th after nine games with a squad that will exceed expectations if they finish top half - to be honest, with injuries to a few players it's a squad that'd be lucky to stay in the league altogether. Benitez has done fine so far. Watford, however, was a horrendous result and he bears some responsibility for it.
But the idea that he's the wrong manager because of it, that it happened because of him, neglecting 5+ years of being varying degrees of inept on and off the pitch, is ridiculous, and I can't take criticisms of him seriously because of it. You cannot name one manager in world football who'd get a tune out of this lot, not a single one, and I can prove it because we've just had objectively one of the best in the modern era - the current Real Madrid manager - and his record at home for us was manure as he sat there watching Josh Maja and Jebbison put us to the sword.
Benitez isn't the problem, the club is. Top to bottom. And the sooner people can get that into their head the better.