Rating: 
Summary: Largely considered as the 3rd/4th best novel in Dune series.
Review: Heretics of Dune is a much better story than book 4 in the Dune series, but not as good as the first two. The quality of the storyline is comparable to Children of Dune, book 3, which is pretty good. Heretics of Dune is it's own unique storyline unlike anything written in the first 4 novels, and is one of the best books I've ever read. The story focuses on Duncan Idaho, and Frank Herbert shows why he is considered to be the greatest military mind/soldier in the universe, and a trump card for a decimated House Attreides. This is a MUST READ for all who love Dune, Duncan Idaho, or Frank Herbert!
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Rating:
Summary: Spellbinding
Review: ...This book is, in my view, in a tie with the first Dune book for first place.It is an entirely new universe since the death of the Tyrant Leto II. The lost children are returning from the Scattering and the Famine Times, and humanity is slowly waking up again.... There is a newness to this volume; there is action; there is great science fiction; there are fantastic plot and character developments; and last, but not least, there are many twists and turns followed by a spellbinding finale - thus, a fabulous sequel to a most challenging and "non-action"-oriented Book4. You will remember why you love the Dune worlds and their author, and thereby will be prepared for the Grand Mother of all Dune books, Chapterhouse:Dune (6), which I have reviewed elsewhere. Cheers!
Rating: 
Summary: The Worst Book Ever Written?
Review: Probably not, but considering that this is part of the Dune series, you expect a little more. Instead, you get a LOT less...
I should have stayed away after God Emperor of Dune (the whiny lead character, constantly spouting poor-man's philosophy, the insane addiction to Duncan Idaho, a lesser character in the saga preceding it, the ridiculous ending), but I stayed the course. I tried to read this book so many times, but I never was able to finish it. Finally, after a year and a half, I did. How boring can you get? And what a STUPID premise!! The Honored Matres? Are you kidding? The Jews? What was the point of the Orange Catholic Bible? I did enjoy the elaboration on the Tleilaxu, but that's about it. The breeding program was bordering on ridiculous in this book (10000 years and they still haven't gotten anywhere?), and the battle between the Bene Gesserit and the (ugh) Honored Matres is just ridiculous. Although Chapterhouse is a LITTLE bit better, I would advise reading the new additions by Brian Herbert (hey, they're not as well written, but they are FAR more entertaining). Oh well, I'nm sure you Scifi fools will reproach me for this, but you know it is true.
Rating: 
Summary: Should have stopped with 'God Emperor.'
Review:
Struggled many times to pick this book up, almost to no avail. Hate reading about just the Sisterhood. The priests on Rakkis are lame, too. Finally finished it, forgot about it immediately. Not sure why he wrote it. Oh well, at leasts it's Dune, right? Three stars because of good writing, but boring boring boooooring.
Rating:
Summary: another great book in the series
Review: I have enjoyed all of the Dune books so far. However, this book was harder for me to "get into" than the others. I attribute this to the fact that none of the characters from the prior book carried over into this book (i.e., we start with all new characters, although old characters are referenced). After a while, I got to know the new personalities. This book shares characteristics of its predecessors: intrigue, action, multiple plots, mystery, etc. The only thing I didn't like: Too much was crammed into the last 30 pages of the book (4 chapters). I think there should have been less in the beginning and middle and more at the ending; the book would have been more balanced this way. At the end, a lot of things got wrapped-up pretty quickly with little explanation. I would have enjoyed reading another 100-150 pages to know what went on behind the scenes. But, that will just have to be left for my imagination. I look forward to reading the final book (Chapter House: Dune). Enjoy!
Rating:
Summary: Out of Sync with the Series
Review: I'm of the opinion that Herbert got bored with his first draft of Heritics and decided to give it a little more kick. Though none of the stories hold anything back, this particular novel was saturated with sex and talk of it. Though sex played a major part in the plot it was surrprising for the relativly clean series. It's still a great story, with Duncan Idaho appearing yet again, Sisterhood affairs, and best of all, the Bene Tleilax! Yes, after four novels many secrets of the enigmatic race are exposed (though there are plenty more to be answered.) If you've been wondering about the race, you must read the book. I won't give anything away (axlotl tanks) about the Tleilax (religious fanatics) so don't worry about that. :-)
Rating:
Summary: Killer Book
Review: The inner workings of the Bene Gesserit have never really been ignored in the previous Dune Books, but their prominence in this Novel was genius.
ONE OF THE TOP 2 BOOKS IN THE DUNE SERIES The ability of Frank Herbert to essentially start over and reinvent a whole new context for the plot to take place in was fantastic. I'm amazed simultaneously by his skill and his daring. It would be so easy to rest on your laurels and extend a successful franchise -- the most successful in history. The fact that he stretched himself spoke volumes about his confidence and creativity. Saying thank you to him just doesn't seem like enough. Mr. Herbert, Thanks (a whole whole lot).
Rating: 
Summary: Eminently Unreadable
Review: To put it simply, herbert carries his esoteric writings a tad too far in this book. Up to this book, i loved the series. It was different, complex, yet not so esoteric that you couldnt catch glimpses of what was going on. All that changes in this book, however. There is nothing particlarly interesting here, since theres no fascinating main character (like Paul or Leto2) whose struggles and mental processes you actually care about. Nor is there an understandable plot (everything is vague, fuzzy). Herberts enigmatic dialogue is elevated to a particluarly abstruse level in this book. Maybe i'm not intelligent enough- but too much was unexplained, little was understandable and on the whole i had the feeling of reading a book in an almost-foreign language.
Rating: 
Summary: Herberts Imagination keeps going
Review: So often writers get stuck in their own universe to the point that each story is the same. Herbert himself started to fall into that trap.. but takes a big break away with this one. Set long after the LetoII demise.. ?? the book takes the series in a new direction. We finally get to truly get into the famed Bene Gesserit's mind/community. Still lots of philosophy.. which to me is as facinating as the action is... and there's more than in God Emporer.
Rating:
Summary: Good till the last drop.
Review: If you wanted closer you won't find it here instead you'll be left aching for more and you'll rush right out to buy the last book in the serious. I found this book to be a noticable departure from the 4 that came before, but it's a good departure with new themes and new characters you can truely see how the years of the Leto II and the years acted truely reshaped the universe and the main factions in it.
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