Real Madrid made a mistake by hiring Mbappe and spending too much money for a player like him. Real Madrid had a much better option but Real Madrid couldn't even use the penalty kick they had.
However, we can't blame Mbappe for everything and he is just a part of this team regardless of his getting the lowest rating in the game against Liverpool I'm sure he was trying to do his best but it was not enough since Real Madrid still lost the match with a 2-0 result against Liverpool.
Mbappe wasn’t bought but came free although he has a high wage but Madrid is a marketing club and I would say the business part of him coming was weighed more higher than that of him playing better football. Although it wasn’t that much of a necessary signing since Vinicius is also playing through that position. But regardless I don’t still think he is a flop or wouldn’t hit his mark in Real Madrid because they have had many players that came and were even booed by the fans but turned out to be the most loved, example is Benzema and Modric. Modric was voted the worst signing in Europe then and Benzema was booed by the fans both ended up winning the golden ball. Another clear example is Vinicius Jnr who even played as a right wing back under Zidane, today he is the fans favourite.
For me Mbappe needs to reduce the pressure on his back and let the game flow it was actually his eagerness to score in every match that is making him do way too much and this would continue but him knowing this is a phase and it will pass will do him much better