While 'Harry Potter and the Cursed Child' is not necessarily bad, it does have a lot of problematic elements in it that make it a mediocre piece of work in comparison to its predecessors. Despite being a play that focuses significantly on how the events of the past affected the present day, it delves way too frequently into the events from the past, causing the play to be lacking its own voice. It uses time travel too much and heavily relies on events and the plots of the previous books to set up a plot of its own. It also disregards several details from the plots of older books and adds details that seem to be inconsistent with that from the previous books.