Re Martial, I think he's a good player that it's good for any team to have in his squad, however the problem he's extremely overrated by his fans here who put him in a state I highly doubt he'll reach. Good player to have, however I don't see any team wanting to challenge for PL wanting him as a main starter every week. He plays hot and cold very often which is bad. Of course, brilliant when he get on running, but on his off days he becomes totally invisible on the pitch.
Of course currently he's one of our best players and should play every game though, but talking in general I don't see him achieving what people are expecting him to, ever.
It's shame our 2 best players in Martial and Pogba are so inconsistent and can't get themselves to play a full season with the same focus, concentration and performance. Honestly the fact our 2 best players are 2 very inconsistent ones might be one of the reason we're crap, because it made us over dependent on them while they will never deliver regularly every week.