I felt the exact same way when I read it. I remember thinking how much I was going to love it when he's on his way to the planet and he's talking about the worms, the sand, the natives, the Harkonnens, the politics, the spice etc. etc. and thinking "Ok this is going to be based." Then he arrives and it becomes the biggest Mary-Sue snooze fest with cheesy fight scenes. Felt like an editing problem or something, and made me appreciate Tolkien's ability to manage both a lot more.