I haven't read the Sisterhood book but I did read the House trilogy that takes place directly before Dune and the books weren't good I thought that there's a decent story in there that could have been salvaged by better writing and editing and I'm pretty sure Kevin J. Anderson is responsible for the bad writing, hopefully the same is true for The Sisterhood.Oh god. I hope the showrunners reign the dumb stuff in as good as they can.
Wouldn't be the first time a bad book is adapted into something greater.