No surprise there. I know many hate King but I think he's a phenomenal writer.
Based on that image, though, I don't think it's particuarly appropriate for kids, especially younger kids, (that sort of more realistic portrayal of violence would probably earn a PG13 in film) who really should be the target of these Walmart books in the first place. I don't think it would be a huge problem for a T-rated Superman book, though.