I'm still torn on it. I really liked it when I first read it, but then the complaints from other folks started to make sense to me.
What I do like is:
It's Shazam.
I think it's a cool format to have it as a mini-story at the back of each Justice League. It's like a bonus you get for buying the JL book.
I honestly don't know a lot about Captain Marvel/Shazam, so maybe it's easier to like for me than hard core Shazam guys.
What I don't like:
The orphan kid that becomes Shazam. ( I forget his name now.) He seemed like kind of a brat.
The way Shazam came out seemed kind of sudden. Like it was the story of the orphan and then all of there was a full page Shazam. But maybe they'll explain more in the next issue.
Overall. I liked Shazam in Kingdom Come a lot, so I am going to keep going with this.