I think the key to Dune is that you have to read it relatively quickly. It's dense with information, and I think you'd begin to lose details if you just read a couple dozen pages a week. Plus, you'd be fighting (remaining at rest) inertia the whole way. When I first started reading Dune, I put it down after a handful of pages, thinking it was to dense, dry and not enough fun. That wasn't much of a fair chance, but then again, I think I was in 4th grade at the time, and maybe a bit younger than its target demographic. When I finally decided to give it a real go, I was in college, and it probably took me until I was more than a dozen pages in before it really started rolling. At that point, however, everything clicked, and Herbert's style was no longer the slightest obstacle. I had effectively started the rock rolling, and it just kept going. I absolutely devoured the book.
So I'd say that if you want to give it a fair chance, keep this in mind. Set some time aside and try to read at least 40 or 50 pages at a time, with no more than a day or two between readings. The faster, the better. You should be able to polish the thing off in a couple of weeks.
Of course, that's assuming you've stopped reading the book. If you've made it all the way through, then maybe it just isn't the book for you. If you went slowly, then a faster reading might help, but I don't know that it would change your mind at this point. Jokes aside, Herbert's prose is a bit dry and matter-of-fact, and I think that some people find that the book lacks warmth and personality for that reason. And I can understand that, even if it doesn't affect me like that. But I've tried unsuccessfully to make it through the Lord of the Rings three different times (it's always the Two Towers that does me in), so I can relate to not being able to get into something everybody else seems to love.