Any Dune novel written by Anderson and Brian Herbert. About the only novels that have made me angry at reading them, felt like burning my copy of Hunters, but it was a library book so. Just the style of writing is so simple, chapters are short as if you've ADD, things are constantly restated, then you get subplots that really aren't at all interesting or relevant.
Apparently Anderson felt Dune needed more action (said the destruction of Arrakis was kind of ignored and that was a bad thing), so sadly we get his Star Wars level action scenes. They also throw in some rather canon violating stuff, mostly minor thinking of it, like Paul leaving Caladan, cause of the Baron's obesity. Only one truly stupid one is the BG being able to cloak or do some Jedi-esque nonsense.