He's only 18, you can't possibly expect him to perform so well in a foreign league he'd be under a lot of pressure. Plus at his age even ligue 1 should be competitive enough even if psg bought him for 100+ and just like @
ChungaHungry said this will easily earn him a call up to the world cup squad. But of course what matters is that he gets enough game time. He already has to compete against a decent set of players to get into the first team.
Can't possibly expect a guy who dominated the Champions League knock-out phase almost against every team bar Juventus (who made it to the final) to perform so well in a foreign league?
Lots of pressure? He showed exactly what he's capable of last season. Playing like he did in CL proved that he's got the confidence of a 28-year old striker in his peak, almost.
It showed that his man does not crumble under pressure. See how calm and composed he is in front of goal? Doesn't matter whom he's up against. He
is the real deal and will only get better as the time goes on.
Mbappé can perform everywhere. Did you see him last night next to Neymar and Cavani? He played as if he had been playing along with such crowd for years.
Also, if you believe the rumours, then apparently Real Madrid had this plan of selling Cristiano back to Man United for £100M (all this drama he had in Spain with tax issues, court etc), which the Portuguese was content with. They wanted to replace Cristiano by signing Mbappé, but it didn't materialize because Mbappé felt like he wasn't at the right stage of his career to start filling someone like Cristiano's shoes,
yet. This also shows how mature he is for his age. Someone who doesn't jump to one of the biggest clubs in the world right away, and thinks what's best for his career's sake before he acts. I really appreciate him for that, and wish him all the best in his career.
Now this thing at PSG, I don't think he'll be stranded there forever.
He reminds me of Ronaldo (Brazilian, the other one I call Cristiano) a little bit, he's got
everything - pace, strength, intelligence, trickery, passing, heading and incredible finishing. Like I said previously, he looks so composed, and calm in front of goal for his age. He'd be grand wherever he goes.
TL;DR - This man does
not crumble under pressure. He'll excel everywhere and is the real deal.