Yeah I'm with you, I always felt there was potential there but mentally and physically he just doesn't seem to have it.
That said I still feel that if we could just get a bit more balance in our team e.g. less trying to beat the offside trap from deep, have the fullbacks not push so far forward and centrally, both which contribute to us being exposed when we don't get the pass right and not getting our best players in the more threatening positions, I think we could carry Martial until the end of the season where we need to upgrade. The one thing he does, although appreciate sometimes he can get it wrong, is slow things down and add a bit of patience to the attack which I don't think is always the worst thing as we have a lot of players who are overly risky when we do get a good chance.