That's interesting, in my experience it's one of the most well loved series DC has done. It didn't sell hugely but it has a very devoted and passionate base. I have heard very few negative things about it. I wonder why our experiences have been so different?
If you don't care for Simone I'd probably say skip it... It's her at her most Simone-y, imo. Which I love but it's not for everybody. If you're a Bane fan I'd say definitely check it out though, she gives him more characterization and depth than he has had anywhere else besides "Vengeance of Bane".