Novel introduction towards something that promises to be so big and epic that I'm afraid to continue for fear it won't meet the expectations.
It is written in the beginnings of King and it shows in the rhythm and structure of the work. From the first sentence, it throws you into the universe of the Dark Tower without knowing the motivations of the characters or even where they are. Little by little, you start to understand what is happening and when your brain is more or less situating itself, it ends.
While writing this, I was going to give it 3 stars but I've realized that despite what I said before, I couldn't stop reading because of the hypnotic nature of the story, and not everyone can achieve that.
So if you take it as a prologue to a bigger story, you will like it. If what you expect is a typical story with an ending, you will be disappointed.