Not really, no. Zlatan Ibrahimovic was criticized year round for his poor finishing despite being our highest scorer and stand out player last season, Pogba was criticized for his casual approach to dribbling, long range shooting and lack of output despite people knowing what a monster of a player he is. Chris Smalling was Mike Maldini not long ago under LvG. Now he is crap and should be sold the first chance we get. Mkhitaryan and Mata are being criticized in their respective threads right now despite former leading the charts with assists and the latter being decent in the games he has played. Fellaini comes on and, more often than not, does well and, at times, gets us some very crucial goals and yet he is butchered every time he doesn't manage to shine. Herrera was POTY last year and is now an average midfielder who cannot take the games by scruff of their neck after the Stoke game. Lingard is never going to be United material no matter how many important goals he scores and Rashford is criticized for his finishing and aimless running and people start calling for Martial to start as soon as Rashford has one bad game despite him being only 19 and consistently involved in changing games.
Martial is being held to the same standards other players are held to. The United standard. You have to perform well and perform well consistently to be free of criticism (Matic, Valencia, De Gea and now Pogba). And the fact is, it's been over a year and half now since Martial performed well in two consecutive starts (not sub appearance mind you).