The long earth, war, utopia, marz

So Im a fan on Steven Baxter and when he teamed up with Trerry Pratchett I was interested. I liked the long earth alot. For me it had a very Jules Verne type of vibe. So I jumped into the long war and was disappointed. The long war just didn't do anything for me. So thats where I stopped. Have any of you read the rest of them and how are they?