I see it totally normal that Mudryk didn't perform very impressively this season. Because the whole squad of Chelsea were very inadequate. Their morale was so low that they even gave up on the season quite early. In this situation it wouldn't be a healthy assessment about a player. There is a new period starting for Chelsea now with Pochettino. This is going to be the most important time period to watch Mudryk's capabilities. If the team make a good start the expectation from him will also be high.
If he still can't impress people then I will also agree with the people who think he isn't good enough for Chelsea.
Maybe in the next season everything can change. Because not only Mudryk but several other players who actually had extraordinary skills before entering Chelsea but then seemed to lose their best skills and performed poorly when playing at Chelsea. I think the motivation and confidence of the Chelsea players last season was really unstable. So they cannot be consistent in maintaining the best performance they have.
But right now Chelsea also don't have the players they really need to strengthen the team. Even though there is news that Mauricio Pochettino wants Rapinha to join Chelsea. But I think it won't be easy. Because Rapinha still has a long contract at Barcelona. And it is not certain that Barcelona will let him go. Unless Chelsea dares to spend more money to sign Rapinha.