Thank God Pep is the manager because if some fans were to have their way then de bruyne would be out of the team after his misses against chelsea and silva for some of his wastefulness in front of goal as well. Im surprised there's still many who seem to doubt his ability even after this season. A player who's joint second in the team for most goals scored and second in assists only to de-bruyne (not to include the countless of penalties he should've won that hasnt been given off the top of my head against barcelona, everton and yesterday) is still somehow not good enough and some even questioning if he can improve is beyond me. There's a reason why pep trusts him and why only kolarov has played more minutes than him through the season.
Now does he have weaknesses to improve on of course, and I'm sure pep and the coaching staff knows it. Its pretty clear he doesn't have a finishers instinct and most importantly composure and confidence when in front of goal. He also tends to at times either rushes or miss-hit some passes but the same goes for sane and almost every other young player around the world. But all these pale when weighed against the many positives that he brings to the team. As frustrating as he can be like he was yesterday, there is also times like against arsenal where he shoots with his weaker foot and gets the game winner in an important game so clearly he has it him. But more important than that and the reason why pep seems to love him, he seems very unselfish in his play. 9 times out of ten he will find a player in a better position for a clear chance at goal when the opportunity is presented like he did for gundogan agaisnt barcelona.
With a player like that you simply have to weigh the good with the bad and its quite clear he offers far more to the team that you can look over his at times wastefulness in front of goal It would be great if he had even a slight bit of confidence and composure in front of goal as he would easily be a 20 goals a season player but thankfully he still has age and time on his side as well as the coaching staff with him to improve that area which I have confidence he will. Everything else is there already in his game, technique, touch, two-footed, he can see a pass and play it, intelligence on and off the ball, tactical awareness are all there. In fact in Sane, Jesus and him you have three of the best young players on the same team whom will all play a big part of the future of the club. As for anyone who doubts his character or mentality you only need to look at his highlights against barcelona this season to see he has that in spades.