If you are judging things in the Van Gaal way of thinking then he may of played well. But if we are being realistic what has been happening with him this season is that the ball has been stopping dead with him and he isn't making the forward runs and beating men like he did last season. He is rather trying to come inside or shoot from distance. His work rate hasn't looked anywhere near how it was previously either.
If you compare Martial to Rashford and Mhiki performances when the two came on they were making space, running with the ball and looking to go forward at almost every opportunity. Hell I give Lingard stick at times but even he is doing that as well.
I'm judging him objectively.
According to Squawka, those are some of his stats from the game against Bournemouth: 3 take-ons, 1 interception, 2 chances created and 3 shots.
In comparison:
Mata: 0 take-ons, 1 interception,1 chance created and 2 shots.
Ibrahimovic: 1 take-on, 0 interceptions, 2 chances created and 2 shots.
Hence, it seems he's had a more than solid game. According to his numbers, he was worse against Southampton and terrible against Hull tonight, so it matches the eye-test. As I said, it's the expectations based on last season that lets people judge him poorly.