I'm just starting to get into the series, and so far I like it. One of my favorite things in its features is that all of the characters look different - even the individual claymore warriors. It's refreshing in comparison to a lot of the cookie-cutter animes out there.
I also love the author's drawing style. As an artist I'm picky about the line quality in whatever manga I'm reading, so this series makes me a happy panda.
One thing I have to throw out there, though, is that the centering plot is a bit overdone. Attractive half-monster girl walks around in skin-tight outfit + plus medieval armor and gigantic, gravity-defying sword while systematically kicking the ass of every snarling people-eater in a twenty mile radius without mussing up her hair. Sigh.
Even so, I can dig it.