Could be sour grapes on my part, but I've been disappointed by the content of at least half of the print books I've read in the past couple years, from The Girl on the Train, to Grisham's Grey Mountain, Camino Island, and The Whistler, to the last few Stephen King issues. At least "Girl" was from a newer author, but releases from older authors like King, Grisham, Robin Cook (the list goes on) pale in comparison to their earlier novels.
Unfortunately, because many publishers have been reluctant to sign new (yes, especially mid-list) authors, they have become overly reliant on old favorites, and those aging authors can't produce what they used to. So, HMH, PP, S&S, you reap what you sow. Fail to plant, you got no crops to harvest. Serves them right.