Dune

I've read dune up to where Herbert left off, should i read the two sequels written by his son or should i stop here? I've heard that they where pretty horrible.

I've bought Dune, the first book before, and it seems to be cursed. It always goes missing, or ends up being taken from me in the strangest ways. So far, I've only been able to read the first few pages, and it seems incredibly hard to get into. The THEME intrests me, but I'm not sure if it's the writing style, or just the book itself that makes it so hard. Does it ever get better, or should I just find a different book?