#4 - Oathbringer - Expands the larger story, but it's the most challenging. A slog at times.
#3- Way of Kings - Excellent beginning to the saga, wild ride. Takes a bit to get going.
#2 - Rhythm of War - Excellent addition to the canon, expands the larger story in unexpected ways, serves as a wonderful payoff to the (seemingly) endless set up in book 3.
#1 - Words of Radiance - Swiftly paced for a 1200 page book. Several HOLY CRAP moments, and an incredible follow up to WOK. Currently may favorite of the four.
How do you guys rank them?