Warbreaker was a great read! It contained everything that I've come to expect from a Brandon Sanderson story... a gripping plot with unexpected twists, humorous dialogue, terrific world-building, a unique and detailed magic system, the themes of faith and identity, highly engaging and likeable main characters (especially Lightsong who was my favourite!), and plenty of political intrigue, mystery, action and suspense. I also appreciated how colourful and tropical the setting of Hallandran was as it made for a very nice and interesting contrast to the world of Scadriel in The Mistborn books.
The only reason why I haven't given this book a five star rating is because I was somewhat disappointed with its ending, as it was very rushed and the sequel for this book that Sanderson eventually plans to write (Nightblood) is set up in rather an awkward way. Having said that I still really enjoyed this book and I do hope that Sanderson will eventually get around to writing its sequel as its characters and world definitely deserves another story.
Brandon Sanderson is definitely one of my favourite writers now: I have yet to be disappointed in anything that he's written and I'm very glad that he's such a prolific author and that I still have a lot more from him left to read :)