One of the reason why Chelsea has decide to hire Enzo Maresca is because he is the former of Guardiola assistant so they thought Maresca will have same football philosophy to Guardiola which very likes to playing attacking and very entertaining so Chelsea was very sure Maresca will be able to bringing this team to playing at Champion League again however some people said sacking Mauricio Pochettino and replace him to Maresca is risky decision because Maresca is lack of experience to train big team besides that the rumours is some of Chelsea players doesn't like with Chelsea owner decision too because they still support Pochettino

But regarding about your question i think it is still hard to answered because the league hasn't starting yet but maybe we can judge the performance of Chelsea by pre season tour later that if they can performing well under Maresca on pre season tour maybe Chelsea will be much better under him but just like i said before being Chelsea manager is very under pressure because it's not easy to make Chelsea to performing well again and Todd Boehly as the owner always set high targets but he doesn't seem to believe in the process and he will not hesitate to sack the manager if they fails to meet the target which he want