Comparing a dungeon in an rpg to any novel is apples and oranges. Novels are very linear-you go only where the author wants you to go. Doing the same thing in an rpg is usually called railroading. The PC's should be able to explore off the main path of the DM's story, even if there is nothing important for them to find.
I don't believe any room described well enough is "uninteresting". It may not have anything to do with the plot or contain anything useful for the PC's, but that doesn't mean it shouldn't be included. It stands to reason that in an old abandoned temple every room is not going to contain something important to the story, but that is no reason not to describe it well.