Thought this was fun, light, sweet.
First, lets just get this out of the way; Dean White on colors makes the art look entirely new, and entirely better. There is literally no comparison; this is a far better, more polished product. DC made entirely the right move, one I suspect was driven by JRJr.
The story itself wasn't dire and there were some undoubtedly awkward bits - the mark of a new writer - but everyone was very human, and you got the sense that the league was an actual group of friends, which hasn't been felt since before the New 52 reboot. It felt comfortable. The interactions were fun, and funny, and clever.
It's the kind of dynamic I think the JL proper could do with more of. The sense that these guys knew and trusted each other, and could have a little bit of fun even as they adventured. Morrison's JLA had it in healthy amounts, despite the world-ending cataclysm and so on.
The actual plot was simple and yet somehow a little muddled - I'm still not completely sure what they're trying to say about his powers long-term or precisely what the new status quo is - but fine.
It was a character piece, and a good one, and probably what Superman needed right now. A reason to like him, as a person.
Anyone who is familiar with GLY's work will know that this, more than anything, is what we can hope for and expect from his upcoming run. I don't expect a lot of really great big ideas or science fiction mechanisms. I don't expect that he'll create many lasting villains, or that we'll have Superman's biggest adventure as part of this run (I'm open to those things, but I'm not expecting it). Rather, I think we'll get a focus on who Superman/Clark Kent/Kal El is, what he struggles with, and his search for grace and dignity through those struggles.
Should be a fun ride.