Masterful. 
 Thus far, my favorite adult fantasy series EVER. (Sorry, Patrick Rothfuss. I'll reassess at whatever point you have a complete trilogy to offer me.) ;) 
 Certainly not perfect--the middle book drags a bit and female characters throughout made a weaker show than I'd prefer. But compulsively readable and SO brilliantly laid out in worldbuilding, magic system, and intricacy of overarching plot. 
 Note: My full reviews for each individual book can be found on my Goodreads shelf. 
 I maintain that the Mistborn world would make a spectacular video game. 
 Seriously. Somebody needs to hop on that gravy train and GO. >.>