The thing that I love most about Stephen King's books, friends and neighbours (well, OK, I pretty much love everything about the books
) is the endings. You get a...
real ending with Stephen King, in that they are rarely happy. I guess for some this can be quite disappointing, to have read the entire book and then find out that the main character dies at the end (
Insomnia, Desperation, The Shining, Tommyknockers (well, a little ambiguous, but I doubt Gard's coming back after that ending!) etc) or that things aren't resolved...but the fact is that not everyone does skip off into the sunset and especially not after going through the things that King's characters go through. I love King endings!
The ending of Cell was fine for me -- I wasn't annoyed that they didn't find out from where the pulse was coming, because really it's pretty unlikely that the characters would just coincidentally trip over it. And the ambiguous ending -- well that left people to make up their own minds. You could believe that it worked and his son would get better...or that it didn't...