CR7 is just designed to be good, he has his own animations etc which help, and great stats too of course. He's also great in the air and pretty strong.
I look at it like this, no matter how good your defenders are, if you switch to the wrong one at the wrong moment, you can easily concede goals. Same for the midfield, you can bypass it quite easily with a quick one-two...
Ronaldo can make the difference every game and people are scared of playing against him as he's so difficult to contain. You can smash shots into the top corner with his weak foot and you need barely any space to do it. Mbappe is doing brilliantly alongside him though, as he always does. His finesse shots are amazing. I will swap him for Bale though when I can.
I like Pogba and have had him a couple of times, but you absolutely have to be able to make full use of his size and strength, he's not as mobile as he should be and certainly isn't worth around 500k.