Due to unforseen circumstances, I am a huge Harry Potter fan. I think that the book series is well done, nay, excellent and a worthy heir to Tolkien's throne. The characterizations and plot are vivid and magical. This translates to the films, too. The Harry Potter films are very well done and translates that sense of magic and desperation and hope beautifully. Therefore, much like a
Star Wars or a
Lord of the Rings, you have two ways to go about a fan film: so amateurish it's fun and hokey OR well done and worthy of the original films/narratives.
Severus Snape and the Marauders is incredibly well done and really does honor the tone and characters of the original films!
