Yep. Big Preston and Child fan here. I've read everything of theirs and have collected signed copies of several of the Pendergast series books.
Child writes on his own as well, and I enjoyed the two of his books that I've read, "Deep Storm" and "The Forgotten Room." The tone is similar enough to the jointly-written books that I wonder what Preston's contribution to the partnership is.
I'm not a huge Lovecraft fan; I always found his ideas more on the surrealistic side than either horror or sci-fi. LOTR, "A Song of Ice and Fire,"--both great epics, although the LOTR books get tedious in places.
I started the Harry Potter books late and had to read the first five in quick succession to catch up when the sixth came out, but enjoyed the whole series enough to read it several times. I don't find them particularly thought-provoking, but I find them entertaining. Who doesn't enjoy a light snack before bed?