Batman has been blessed with a really interesting Rogue's Gallery. There's a lot of depth in those villains, and frankly, they're pretty scary as a whole. Hush has the distinction of being one of the creepiest, and with his competition, that's really saying something.
There's a lot of backstory here, about what made Hush who he is now. His current plot is the main focus, though. As the cover implies, it's much to do with Catwoman. Basically, Hush has heard through the grapevine that the events of Batman: RIP are about to happen and wants to kill Bruce Wayne first. His tactic is to get at him through the people he loves, starting with Catwoman.
I'll be honest, I'm kind of a Dini fangirl, so I'm going to like pretty much anything he does. But I do think it's worth it even if you're not a huge fan already. Hush takes center stage, and he's a strong enough villain to handle it. I liked the direction of the storyline itself, and I liked that it could have had lasting consequences. The art is great, especially the fantastic covers. And there's a great Joker cameo, which always makes me happy.