I never put much stock in the actual material that my kids read (I have five kids), as long as they read. It could have been anything from comic books to repair manuals to the back of baseball cards, as long as they read. Once they got in the habit of reading, they branched out in every direction on their own. Not sure if any of them have read Moby Dick yet, but give them time. I'd rather it was their idea.
In fact, I taught myself French and German mainly by reading comic books. It's perfect- you have a picture associated with simple text. I graduated to simple tabloids, and then newspapers. I speak both languages better than most kids who took four years of it in high school, and often read tech manual and carry on conversations with foreign engineers. I'm not here to bash schools, but we are not all the same and it worked out much better for me that I learned French and German about the same way I learned English. I became fluent in English without knowing what an adverb was, so there was no reason I couldn't do it with other languages too.