What they got right: I can understand the use of fill-in writers since Kunkel is having trouble with the schedule due to outside factors, and we do get a decent story. It's also nice to extend the supporting cast beyond the Wizard. Back in the day, the Shazam! series featured a larger cast than the Wizard, the three Marvels, and a few odd reoccurring villains, which seems to have disappeared in today's DC.
What they got wrong: I thought Silvana was supposed to be some kind of mad scientist in the main stories. In this version, however, it seems he's a former attorney general who can claim giant robots in the name of national security. I know this is a "kid-targeted comic", but does that even make sense? Also, the best way I can describe the artwork is a mix of Chuck Jones' later cartoons, Tiny Toon Adventures, and maybe a touch of Ralph Bakshi. I suppose it works, but not with Kunkel's character models. (At least they didn't try to mimic his style.) Mary squeaks by, but Captain Marvel looks too big to fit in with the other characters (and the cape's still too small) and Billy's eyes turn into big black dots for two panels. It just doesn't line up. And I'm sorry, but not only is that not Mike's best artwork on the cover, but it has nothing to do with what's going on inside. "Family Affair" doesn't seem to have any connection to the story, unless that's the name of the next arc or something.
Recommendation: A fun story while reading, but there are some major flaws that need to be fixed.