The top forwards all have this single minded ness to score goals, just a pure drive to get into the best areas and take maximum advantage of any situation. Watching Martial throughout the match though, I find myself shaking my head. He just doesn't have that natural instinct to find space in behind, to dart into areas, to anticipate a cross or a loose ball. He doesn't find opportunity, he just wants to collect the ball to feet and play one-twos, to me he is just not a natural striker. Though I would admit that he has improved on his forward play since converting from winger, but still sometimes, he regresses during the match.
But its his off the ball movement, that really irks me. When the ball moves out to the flank, or when there is a counter attack on, most forwards will be steaming into the box to get on the end of any chance, but most of the time Martial would be casually jogging away, or lagging behind the defenders. And how many times he is caught flatfooted and does not anticipate or win the second ball. Must have been why Mourinho was on the verge of selling him, he would have been totally useless in a direct counter attacking team.
The second part of his problem, which is the biggest problem i feel, is his concentration levels. Throughout the match you can see him behind in play, not finding the right spaces, not pressing correctly and generally not making the right decisions and not being alert enough. That all comes down to concentration, at to me, it seems he just switches off way too much, which is why its so typical of him to drift on and off during matches. With all the natural football talent, its such a shame that he can't execute when it matters.