Time and your personal experience might be a factor.
Often the first book I read from an author, leaves a very positive and fresh impression, but after I read a couple more of the same author, I learn their structure and writing style, and it becomes just more of the same, and I have trouble getting into those books.
It is similar in other mediums as well, maybe to a lesser degree. TV series and video games have multiple writers to keep things fresh, but at some point it becomes just more of the same.
You can still try to replay/rewatch/reread the great ones, but then you know what to expect. This might not be the case with new media of the same authors.
Also time directly might also effect it, I have trouble really getting into any game now, because I have other stuff to do, and getting back into it afterwards (especially with video games) is more difficult.