I added a public list to goodreads called Chapter Books Ages Six through Nine (age range is murky). It includes "the best" fictional chapter books that my DS has actually read (or listened to) or is currently reading. I will add more "best" books as we read them because there are many more wonderful books to explore.
I thought it might be helpful as parents looks for book suggestions.
I, personally, didn't find much objectionable content (I'm not too strict about content or language unless it's far out of bounds for a seven year old) - maybe a few dated words or situations in some of the classics.