No one doubt that Mbappe is one of the most valuable players in the world. That's why he has an expensive price, not every club has the ability to sign him. Sure, he doesn't only won the title in PSG, he also won the title with France national team. He proved that he is a sharp striker both in PSG and in the world cup competition. So, everyone must agree that he is skillful, experienced, and has the ability to be the best player in the world. That's why Real Madrid really wants him, he has the criteria to be Real Madrid machine goal. I believe he will be more successful if he moves to Real Madrid.
But PSG isn't right position to make Mbappe more valuable due his contract left one year, its difficult for PSG push up Mbappe's values because not any one teams interested for signing Mbappe and most of teams waiting until his contract over and sign him as free agent than have to spent much money. Indeed Real Madrid as teams rumor close to sign Mbappe but until right now not bid official proposal for signing him, I think Madrid tries waiting until PSG announce with official transfer offer.
For qualities, no one doubt with Mbappe but difficult sign him due expensive transfer fees from PSG and the interested teams faced difficult have to pay more expensive salary for him.