I think the issue is that you questioned Martial's talent or skill. There's a lot of things that Martial can be criticised for, but that is the one thing that can't be questioned. In terms of pure ability he should basically be a slightly worse Benzema. That's what is so frustrating with him as, other than his debut season and 19/20, he hasn't reached anywhere near the level that he really should have.
It's his workrate, his consistency, his mental toughness, and now his injury proneness that can certainly be doubted. And those are the things that have stopped him becoming the player he should have, not his ability.