It's a good movie for the most part but "based on the book" is extremely generous.

I don't just mean in the film adaptation loses details kind of way, I mean thematically and experientially they're quintessentially different stories, and I'm pretty sure that they just threw the title on there to give it a bump above like, "The Forgotten Battle" and "Siege of Jadotville."

This isn't to undermine your point or to tell people not to watch it. Just go in with that knowledge because knowledge is power or whatever Shao Khan said at the beginning of Ultimate Mortal Kombat 3.