Martial is one of few in the entire squad who many would believe has a ceiling and level of potential beyond what we've seen to this point in time, and his talent makes that hard to refute, particularly on any level of absolutism as we've (fanbase) got with a lot of others in the team who are classed as not good enough and ripe for culling the moment replacements can be found. Martial, then, is far removed from the critique or even consideration lesser lights get, because there's no hope or belief in them in the full term - isolating Martial is actually a credit to him, and as the question asks: is it down to him, or is it the team around him that is holding him back. You wouldn't get legs out of the same question put forth for anyone else but Rashford (Greenwood is no part of the query given his age and growing pains etc.) because they're seen as write offs or eventual squad members at best.
I would love to see Martial succeed here - you won't see a single post of mine to the contrary. When he's not doing well, I don't mention it nor get involved in those threads because I have had my own preconceived notion that he'd be just fine once those around him were of a certain level. I thought it was an interesting talking point because perhaps that's not the case, and perhaps there is more to it/him than that. For me, he's at least a partial enigma. I feel like I have the answer some of the time, but others not. I'm not interested in cliches as I will always conduct my own analysis and conclude from it.
But anyway, it's annoying that threads are being shoehorned into one thing or other on tracks instead of just simple discussions where no agenda is assumed. 'Martial' should not trigger Pavlovian response with blinkers on - question can just be questions.