There is no doubt that Mbappe is a talented player. But adapting to the new environment and new match strategy of La Liga is a bit difficult. Moreover, Mbappe's position at Real Madrid also had to be changed. Because of these reasons, Mbappe's performance is somewhat erratic. But Mbappe is very talented. He will surely adapt himself to this squad very quickly.
Mbappe and Vini do not have a friendly relationship. Moreover, Bellingham, one of Madrid's most important players, is not in the squad yet. Bellingham's return to the squad will surely stabilize Madrid's performance.
It's still early in the season so we can't measure Mbappe's true strength at Real Madrid because he still needs time to adapt and for individual quality Mbappe is indeed quite capable and of course it is very likely that he can develop much better with Real Madrid.
I don't understand why currently many are speculating that Mbappe's relationship with several Real Madrid players is not harmonious especially with Vini, I don't think so and regarding Mbappe's not yet strong chemistry with Real Madrid's front line, it's all because Mbappe is a new player and needs to adapt, I think we don't need to exaggerate what is happening right now, everything takes a process and time so let's just wait for Mbappe to be able to adapt with other Real Madrid players.