What's so great about Brandon Sanderson's Mistborn?

Sanderson was just setting things up with a very focused and exciting narrative for the first book only to then continue to expand all of these things and answer all of my questions as the books went on

that's the entire third book 700 Pages across the hero of Ages exploring our relationship to religion and God and it is so captivating you tear through the third book as you piggyback off sanderson's imagination and his theological ponderings about religion about faith and gods and what different gods mean to different people

the second novel has an enormously twisted conclusion it reveals something that shifts the entire status quo of the world and our understanding of how the world operates something changes something really enormous something that is ethically and morally fascinating even psychologically fascinating