I actually really like Stephen King's work. I think he's a terrific character writer and though some of his books are much better than others, I think for the most part he is actually a really good writer. I think my top five pieces of his work are:
1. Apt Pupil
2. The Long Walk
3. The Stand
4. Rage
6. The Running Man
But I do like others including the Dark Half, the first four books of the Dark Tower (plus the ending-ending--YES, I actually do think the ending is perfect but that series...well, you know, things get pretty squiffy after Wizard and Glass with You-Know-Who being a character in the series (trying not to spoil it)), Duma Key, and most of his short story collections. In fact, I think short stories are definitely his strong suit. Skeleton Crew is probably my favorite of his short story collections.
In Neal Stephenson's case, I love him but I haven't enjoyed his last two books. I loved when the scholars sat around and talked in Anathem, but other than that, I thought the book was pretty poorly planned out. And Reamde was just a lackluster version of Cryptonomicon (which might be my favorite of all his books).