No he was not. Both Gomes and Chong were better than Martial. I don;t think he was bad like Lingard but as a Martial fan I expect more from him. Maybe you are right, he would have been better if he had rashford, James AWB and Pogba.He was probably the third best player after Pereira and Jones in that second half. As usual very composed with the ball, showed moments where he looked light on his feet following the groin surgery and took his penalty well.
Comparing him with Rashford is so illogical when you consider the two teams put out. Rashford had Pogba and Mata behind him with runners like AWB, Greenwood and James on the flanks while Martial played upfront in a formation with little to no width ahead of Lingard who produced one of the worst pre season performances I've ever seen. Some simple critical thinking does wonders.