The Oz Squad is the story of what happens when Oz opens diplomatic relations with another world -- Earth. It's violent, dark, and shows a grown up Dorothy and Ozma.
Now, I tend to be an Oz purist (Dorothy is blonde, dammit!), but I'm okay with reimaginings, such as the excellent "Wicked", and I'm not bothered by adult themes inserted into this world, either. I'm also okay with the idea of the kids, such as Dorothy and Ozma, being mentally and emotionally grown up, although for some reason the idea of them being physically adults as in this series bothers me.
Bottom line: It's not the traditional Oz characters, and it's definitely not a kid's comic book. Still, it's nice to see some favorites from the books (even if some of them are homicidal maniacs!), it's fast paced, and it's a fun ride.
(It also makes me that much more antsy to someday write an Oz tale of my own.)