I like the first 3 books about equally. God emperor is probably my least favorite of the main series. I still think its a good book, but it was a bit of an awkward transition in timeframe to me. The first 3 books took place in a few decades, then suddenly its 1000 years later and Leto has become a giant worm dictator. It just felt weird to me. Of course, it got weirder after that, but for some reason God Emperor is just the book I like a little less than the others. still, I've only read it once (unlike the first three books, which I've read a lot) so with my rereading the series I might feel differently about it.