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Yes, I think it is. Just give it some time to evolve, and try to be patient with it. It's got the same issue as other complex sci-fi adaptations (e.g. Foundation), where they need to do some world-building and take a bit of time to clarify and highlight some characters and arcs before they can really go to town. But I have a feeling that starting with the next episode (#5) things will start getting a bit more consistent and interesting.

It has a similar feel to the movies, and a good cast. The dialogue is a bit stilted sometimes, which makes the actors look mediocre. But they are all good actors and are doing their best with the material. And there are some very interesting characters in there (e.g. Desmond Hart and Theodosia), among a number of 'blah' characters.

I haven't read the Sisterhood novel (I read the Prelude trilogy and stopped there since I didn't like Brian Herbert's writing style and how much he and Anderson repeated plot exposition). But from what I understand, they've made some major changes to the plot arcs in the show. And they seem to be improvements.