The Premier league is a very competitive league, and it is obvious that practically everyone is aware of Mudryk's potential. He simply needs time to get used to the league, as some players do, and you can't immediately condemn him to be a horrible player after one season. Can we infer that Hazard is also a poor player if that's the case? since he didn't perform well at Real Madrid. You can't just jump to conclusions just early because Havertz also struggled at start but eventually picked up and improved and helped the team win the champions league. Mudryk is a very intelligent player who has room to grow, so I think you should wait before drawing any quick conclusions.
Havertz is a substitute player during his first season with Chelsea, he also can score 4 goals at that time. Mudryk is a starting line up in Chelsea, he mostly play in every match. Yes, Hazard is a poor player when he joined Real Madrid, one of big mistake by Real Madrid to sign him similar like Mariano Diaz.
I'm pretty sure Mudryk will not contribute anything in the next season, he has a good speed, but he lack of dribbling, shooting and decision skill which is really a big problem.