This film however failed to capture me, however I wouldn't doubt at all if it has a fanbase or even is now looked upon as a cult following. To me Dune was full of uninteresting characters wrapped up in an uninteresting plot. The highlights of this movie belongs to its set pieces, costume work, and it's incredible score. It may just take me another viewing...
There is a lot to grasp the first time watching it as the Dune universe is deep and there are multiple factions that have their own objectives while being manipulated behind the scenes by the emperor of the universe to keep his political power in check.
The extended version of the film helps to explain who the players are in the movie and their goals which in the theatrical version required multiple viewings to get a grip on if unfamiliar with the book the film is based on.
If you plan on watching I would recommend the extended cut as it will help greatly to understand this masterpiece the first time out as it is a cerebral type of film with concepts of scuence that were unfamiliar to audiences of the day. In comparison Star Trek was taken off the air for being too cerebral and it ended up making history for 50 years now. Dune will only grow in popularity as time goes on and the critics who trashed the film will hopefully never be taken seriously again when looking for a film to see.