He was most definitely not 10/10! He had a good world cup, very average group stage but good in knockout games, but he wasn't even top 3 in terms of importance for them IMO. Personal opinion anyway, don't expect many to agree but I still think they would've won the world cup without him, considering the way they played. Grinded out results with the overall system, and hitting long passes for Mbappe to run on to and Griezmann leading counter attacks. He did compliment the others well, but what he brought wasn't anything exceptional during the world cup IMO. It was good and consistent play, but France has a lot of depth that his role could have been played by a few players with similar success.
Anyway, like el3mel says, good world cup, but literally none of that matters when we're talking about United, and he's been more trash than good for us.