Leto II is such a fascinating character, at first I wanted to hate him because Sabina does...
You mean Siona
, right? There's no "Sabina" in God Emperor of Dune.
Heretics and Chapterhouse can be difficult to get into at first, because of all the new characters. Once you get past that, I think they are enjoyable and thought-provoking. The image of the BG Reverend Mother with the Van Gogh painting on her wall has stuck with me.
But... ERASMUS THE ROBOT painted that! KJA/BH said so!
I love Heretics as it introduces two of my favourite characters: Waff and Odrade. I think with Odrade he'd finally distilled his perfect BG sister. I'm curious if others feel the same, but it felt for me more of a balls-to-the-wall space opera after the introspection of GE. Chapterhouse I probably need to re-read; enjoyed the politicking but felt inconclusive as a finale (as we now know...
I always liked Lucilla more.
As for Odrade... you could make a drinking game out of how many times she stares at people.