Short summary:
Clark is infected with wrath but he can control it and beats up bad guys for cops to arrest.
Calls on Henry/Lana to help with rescued people and bails on Lee. Since he is infected he can now travel via shadows and track down Wrath.
Lee followed him in same way and Wrath was waiting for them since she can feel whatever is happening in the shadows.
Basically her black sticky stuff infects people, it does not change them, it just puts their anger forward. Her plan is to drop it on everyone and to clean the Earth from monsters. Lee is able to resist this influence and Wrath says that she is the key to new, better world.
Meanwhile she brings an enforcer - infected Frankenstein. Issue ends with Superman fighting against him.
Couple of points:
Its not going to change anyone's opinion on this run. I liked what happened before and I liked this issue too, those who didn't like earlier issues won't like this either.
Fact that black stuff doesn't really change people works for me pretty well since it means that, for example, evil cop was evil even before he got infected. Its kinda like alcohol when people start doing stupid stuff that they wouldn't do otherwise yet have thoughts about it somewhere deep in their heads.
Superman is shown as enjoying this anger and Wrath sure likes to taunt Lee with saying how Clark lost it, but reading his internal monologues its fairly obvious (at least to me) that he is giving in to get an edge against the Wrath/Frankenstein and save people, he does seam to be in complete control and likely will be able to pull out of it on his own once he saves the day.