I've read about what happens at the end...I can understand it would leave people feeling like that, from the sounds of it
King basically argues; 'that's the story fuckin' deal with it.'
I'm not a great fan of the ending, but I can live with it; it explains a lot of Roland's obsessive nature.
*on topic*
Just (ahem) acquired Steven Tyler's (auto?)biography, and Kurt Cobain's private journals.
I'll be sure to fill you in. Although, Im not sure reading close to 300 pages of Kurt's scribbled/handwritten ramblings is gonna be the greatest literary experince I've ever had.