You know the biggest shame of all of this?
The movie could have actually worked.
https://www.reddit.com/r/TheDarkTower/comments/4x1egu/do_you_guys_have_the_script/
On this here reddit page is an early script for the film. It essentially fills the same purpose that this... THING that's currently in theaters fills. A sequel to the book series that takes elements from different books to fit a new adventure in the new timeline.
Except there's a few key differences.
1: No serious continuity issues with Roland's backstory, like Walter killing his father.
2: The Horn of Eld being in Roland's possession is something addressed, making it clear that it actually IS a sequel.
2: The Crimson King isn't just relegated to references in f***ing graffiti. He's an omnipresent threat, addressed by Walter O'Dim and his followers. Hell, he even makes a cameo at the end!
4: Most importantly of all, the overall feel of the story is about Roland's journey. He's not relegated to a secondary character to prop up Jake as the main character (SERIOUSLY SONY, WHAT THE FLYING F*** WERE YOU THINKING?!), and his character arc is of redemption and finding his purpose again after years of looking for simply revenge.
If they had made THIS into a movie, a two-hour fleshed out movie, then perhaps we would have something to be happy about.