Seriously. And I think this is exactly what happened to Mbappe when they bought him to Real Madrid; the hype was too much, and the expectations were too high, and that is what Mbappe wants to do; that is why his performance was this way. He just wants to make people expect it, so I feel like that is what happens to his performance, so you are right with what you said: players cannot play freely due to what people are expecting from them, and he really wants to make it possible for the fans.
Mbappe was hyped to the point was almost seen like the one who was going to single handedly take Madrid to the UCL and probably ring home the trophy again for the third time in a row probably, so the expectations where raised too high and that is why currently he doesn't seem appreciated enough because it keeps feeling like he's not doing just enough. If they had lowered it a bit and allowed him just play to the estate of his abilities as a new player who joined the team, probably there would have been some changes that would have led to some improvements.
For me it is normal when Madrid fans and Mbappe fans say exaggerated things about Mbappe before when he joined Madrid.
Previously Mbappe was the most well-known player as a scorer (in league 1) but unfortunately we sometimes forget that the competition in each league is different. So it is natural that Mbappe may not look impressive at this time.
I still strongly believe that Mbappe only needs a big mentality at this time to be able to help Madrid win the title again. Because I see Mbappe's confidence is not too big and he is not used to joining a big team like Madrid.