Warbreaker

Compared to Mistborn: The Final Empire and Stormlight Archive: The Way of Kings, it has a much slower start. It does a really good job building up into the world and exploring the plot points. It made me really come to enjoy all the characters and look forward to the world being explored in future releases, but I know if you need the plot to get moving there's a good chance you'll bounce off this book. I think the magic system is decently explored, but definitely not to the level of the other books by Brandon Sanderson.