I was fine with the ending - not jumping up and down, but I felt it was typical Mr. King ending - living threads open and letting the reader end it as he or she may.
And as for wanting to give up all your books because you disliked the ending of one of them... Well, my fellow Constant Reader - are you not overreacting?
And let's face it - in the final pages, right before the ending, Mr. King told you that you will probably hate it, told you that you are better off leaving the story untold all the way through and that the ending he thought of will not make you happy.
You chose to continue.
Why are you angry, then?