I read Green Team. It was pretty good. He tells a good story, albeit he is no Shakespeare or (R.W.) Emerson when it comes to diction. Probably the best thing about reading the books is that you know the guy has "been there and done that", so he knows what he is writing about. As somebody has already pointed out, there is some kind of hint that his later books (after Rogue Warrior) might have some truth to it, even though it is written as fiction, "Variations on a theme" as somebody once called it. They are written in first person, which makes it more exciting in my opinion.
But, then again, Harry Potter is not written in first person, and it is exciting as well.
Anyways...
Personally, I did find Green Team to be too vulgar for my taste, so take note if you care about that kind of thing. I doubt that his other books are any different. I certainly hope his leadership books have more tact to them, but coming from a guy like him, there is no telling.