i'm a Stephen King fan, but the man really doesn't know how to create a satisfying ending
he can craft an excellent story. His character development is unmatched, he really makes these people REAL.
He can draw you into his world(s) & leaving you thirsting for more
Somewhere around the halfway point, the story starts to fall apart...or takes a turn that you'd rather it not take
the ending is usually anti-climactic, or just plain silly...often leaving a bad taste in my mouth & making me wonder what it was that kept me reading the whole damn book in the first place
This is evident in most of his books and The Dark Tower Series just illusrates this on a larger scale
The other big problem with The Dark Tower series is that it just took too long...much like The Star Wars Prequels, there was simply too much hype & expectations were too high
in the huge gap between the release of book 4 & book 5, too much time had passed.
the writer had changed so much in that many years (as had his audience) that it was impossible to create that same magic in the same way
the writer had been away from that world for too long, and just couldn't find his way back.
it was rushed; it was forced; and ultimately, it was destined to disappoint