There is at least one other topic about Abercrombie lying around with more thoughts.
For me, I think his main series The First Law (Consisting of The Blade Itself, Before they are Hanged, and The Last Argument of Kings), is a great read. His characters are great: they are all dynamic, they have a lot of depth, and they all operate with some kind of grey morality (no easy right/wrong). There is a lot to like, and I'd say your missing something if you don't at least read the first book. BTW if you like to listen to audiobooks, this series is probably the best I've ever heard.