Mbappe is an excellent player as evidenced by his national team performances. Mbappe had a great performance in the France jersey. Mbappe's performance in the World Cup also impressed everyone. But while Mbappe is a great player, he is a bit selfish. As if Mbappe's selfish gameplay had a negative impact on the team's overall performance.
I don’t seem to see a reason why you called Mbappe a selfish player. He’s a great player and a very good attacking player and also good at finishing and that gave him an edge over other players. It won’t make sense to call a player being selfish because he scores more goals than others but I don’t know where you draw your conclusion from. His performance has only contributed positively to both his national team and club side.
Kylian Mbappe is a forward player who's priority is to score as many goals as possible and sometimes he does need a beat of selfishness to perfect his scoring tricks. But that doesn't make him a serial selfish player.
We all saw what he did with the France national team in last year's FIFA World Cup tournament and how he was very close to making the most important comeback in football history.
Mbappe surely has his own shortcomings as a player but certainly not to be tagged "selfish"