If you want to read about someone worthy there’s Classic Marvel Thor.Im of two minds on this.
I really liked that the New52 Billy wasn't just naturally the "best kid in the whole world." I imagine the wish fulfillment quality of Shazam dies awfully quick when a kid realizes he could never be Shazam because they're not always perfect. I like the idea Johns brought in, that being "worthy" is an active choice, something you decide to be and not an innate quality you're born with. It also goes well with the "family is what it can be, not what it should be" angle, which again, seemed very fitting given Billy's orphan status.
And while the first backup issue went way overboard with the "this isn't the Billy you knew!" crap, that extreme quickly fell away and Billy was much closer to what we remember for most of the story. Still not the perfect, always-good little kid, but far closer to it than the first issue would have us believe. There were actually some really great Billy moments in that story, you just had to suffer through the first issue to reach them.
And of course, the way Johns instilled the Rock of Eternity with this "Harry Potter" type of fantasy.....that was brilliant in the most obvious and fun way. In my opinion the Rock had never been better than it was during that backup. Perfectly built to capitalize on Rowling's genius and a seamless mesh of superhero and Hogwarts.
But on the other hand, the character growth and journey Johns put Billy on in the backup was completely forgotten and ignored afterwards. It seems pointless, almost cruel, to establish this character arc and then ignore it, as if Billy himself had back-tracked somewhere between defeating Black Adam and joining the League. It was very disappointing. And that goes for the whole backup story. Sivana and Mr. Mind, Mary and Freddy and the other kids......the entire backup ends up feeling like a huge waste of potential because no one, including its original author, could be bothered to follow up on it.
And I never did get over Freddy being blonde and *not* having a rockabilly obsession.