I read the books back in '75, saw the first movie in '84, but didn't see the Sci Fi Channel miniseries remake until just now.
The books have the strength of being quite original (for their time), the Lynch version has the strength of a generally better cast and better overall design, but the miniseries has a better sense of scope. The main weakness in the miniseries is that Jessica and Paul look too close in age; there is this awkward chemistry between them you didn't get from Kyle McLaughlin and Francesca Annis 20 years ago. Oh, and those funny hats so many of the characters (especially the Bene Gesseret) wear.
While 2 1/2 hours was probably too short for the Dune movie in 1984, 6 hours seems too long for the miniseries. Irulan, for example, was better as a background character in the book and the Lynch version than almost a lead character in the miniseries.
I look forward to seeing the Children of Dune miniseries though. I rather like Dune Messiah (a book generally disliked), a book that will be part of the next miniseries. I'm intrigued that Alice Krige (aka the Borg Queen) will play the Lady Jessica, along with Susan Sarandon as Wensicia.
Thank goodness for PVR as both Six Feet Under (my favorite show) will be on against Children of Dune on Sunday, along with the very interesting-looking Normal on HBO. [sigh]