If Black consideres him, he's probably a good actor.
But i was looking forward to someone with more star power behind him, being the lead in an event picture that is supposed to line up people. I just miss the "clash of the titans" feel the first movie has, when someone like Schwarzenegger is up against the seemingly unstoppable evil, you just get that attention when you cast people like The Rock, Del Toro, Hardy, Bale etc., established action heroes.
I'm not saying it won't work, i like Brody as Royce for example, i liked the Bear Grylls kind of charm he had, but i was hoping for a bigger lead this time.
So the general feedback from people being disappointed by this news is totally reasonable in my book, but it's good to hear the movie is going forward.