Hasn't Afflex proved to actually be a very competent writer and director?
Absolutely, I'm really excited to see what he'll do. Especially since he'll be playing Batman, so I'm sure he'll push the envelope a little bit there.
I'm more confused as to why Johns is co-writing, though. Like I said, he's pretty bad at writing for Batman. My guess is that he's gotten really popular over the last couple of years, and became a higher-up at DC. He probably got first dibs.
Rocksteady got his input for the character of Arkham Knight, so... take that as you will.