Folks, settle down. 
If you are willing to call yourself a fan of something, you are a fan of something. This "true fan" nonsense is unnecessarily divisive. 
Some fans like the Bungie games, some fans prefer the 343 games, some fans think Halo: CE is the one and only true Halo, and some people love them all. They are ALL fans. 
You can have your own opinions, but don't say someone isn't a fan because they don't like what you like or vice versa. 
Are you a fan of The Witcher? Are you a fan of the books, games, TV show, or all three? All options are equally valid. Everything has different types of fans. Quit being childish or I will put my Moderator hat on.