I've only read his Kingdom of Thorn and Bone series, which was pretty good. There were interesting, entertaining (if sometimes archetypal) characters, a decent plot with quite a few surprises, some intrigue - a simplified version of the politics in ASOIAF. I think the Charnel Prince was a significant improvement on the Briar King, mainly because the latter focused on its namesake, which IMO wasn't a particularly entertaining plotline. However, the prologue of the Briar King was excellent - I just wish the rest had been of the same quality. It's not up there with Bakker, Erikson or Martin, and just a little behind JV Jones' Sword of Shadows, while a little better than Hobb's Farseer.