I finished The Stand recently; I had put it off for years due to the length, but I breezed through it pretty quickly. In regards to what someone on the last page said in regards to disappointing endings, I both understand and politely disagree with that point of view. Both The Stand and The Dark Tower are almost blatantly anti-climatic, what with both seemingly ramping up toward a big face off with the big bad, but I feel that each subverts this expectation purposefully, tying in with the themes and journey's of the characters.
With both The Stand and The Dark Tower Stephen King seems to build up his villains to a mythic status, often before we even actually meet them, but when we do meet Randall Flagg or The Crimson King, they reveal themselves to be pathetic, frightened individuals who are often the cause of their own undoing. The Stand, in particular, almost entirely builds up the villain through our heroes' dreams, but, by the climax, we find him to be the one to initiate his own downfall.