I'm one of those lucky guys who packed him in the totw sbc and after a short time of getting used to he is just on another level from other cards I liked and used. I've tried FB Pato, 92 Neymar, Tevez and other similar rated forwards, and liked them all, but Mbappe is so quick, so agile and his shots seem to be so much more powerful than any other card with a higher shotpower rating. 8 out of 10 shots is a goal.
He is so quick, his balance makes him very useful in sprinting while shielding and lets him take well aimed shots while under pressure.
Heading, his aim is pretty poor.