What exactly do people mean when they say "going forward" he is bad? Is it because he doesn't try to drible his way through against an organised defence? To me Evra was not the most effective going forward stats wise, he played in a great team, was an attacking fullback, yet didn't always contribute with goals and assist. The thing that he always did do was contribute with movement, and he made himself available in the offensive play. Now Bissaka isn't the same player as Evra, far from it, but I wonder how effective Evra would be in this team. He wouldn't. He would be isolated with no creativity around him, expected to drible and cross, and guess what nobody would be in the box.
I've seen Wan-Bissaka play himself out of pressure in situations, with quick passes and transition it into an attack, I've seen him put in good crosses, and I've seen him pass between the lines to the striker and even through-balls into space for James. While he isn't doing these things consistently, our team aren't really making it easy for him to do so. He has been great defensively and shown good potential offensively at worst, imo. He makes himself available offensively, it is just that not much come of our established play. If he does a quick one-two and passes it to Lingard who loses the ball, or Pereira who's shot is blocked or Mata who passes it back, that is not on him imo.