How involved is Lee Child now?

I fall into the camp of really not liking the Andrew Child books. Partly due to the stories themselves but mainly due to his writing style. Short. Sharp. Sentences. The thing is though, I don't remember the first one or two where AC was involved reading like that, so I'm wondering how involved was LC when he first got his brother involved and how much is he now? I've just finished In To Deep and thought it was pretty awful, so think I'm at the point where I may bow out of reading any more.