Your enjoyment of this show will greatly depend on your toleration/love for fanservice.
The animation in this 12 episode series is superb all the way through. I'm a big horror fan, and there was plenty to love here for fans of gore and needless bloodsplilling. It's not a scary show, but instead an over the top approach to what a zombie outbreak would be like.
One thing that breaks or makes this series is it's excessive fanservice. If you are into that sort of stuff you'll love this series but if you're the kind of person who rolls their eyes at panty shots and jiggly breasts you'll find it hard to sit through this one.
Overall this is a great deal packed together with the OVA and I really recommend this for any visual horror fan.