Definitely not trying to yuck anyone's yum, but I like the power sharing aspect for the reason Güicho stated - it shows Billy creating and connecting to a family in an emotional and magical way.
I like that Billy and Mary might have a more special connection and power set to the Lightning, given their biological family ties, but also that each of the other Shazamily members might have a particular power highlighted when Shazamified, that's slightly different than Billy and Mary.
With power-sharing, I also like that it might make each of the characters less powerful as an individual, but more powerful as a unit. Like a team, or a, wait for it...family.
I have no idea how they'll go regarding the gods empowering Billy and the fam or if it'll revert back to just the magical Living Lightning as Johns first introduced, before they changed it up to the gods again. Something else to consider is that I hope that Mary finds she is able to call on the powers by herself, but the other kids have to rely on Billy sharing the power with them to transform into their heroic identities. There could be some drama and teen angst and vulnerability and wish fulfillment themes to explore within that and a family structure - given the personalities and nature of each of the kids and reasons why they like being Shazamified and needing to rely on Billy to do so.
I love the aside comment that Black Adam made that Billy obviously didn't understand the full extent of his powers or power-sharing abilities with others or animal companions, before he naturally figured out how to do it. It's great that there are some mysteries about the powers that Billy and his family will have to learn to "unlock." I'm looking forward to them learning from the Wizard or other magical beings or histories of other characters through time, after Black Adam but before Billy, who were champions. (That suit of armor makes me think there might have been a medieval Shazam character, or at least one from another realm of magic.)
That all said, I wouldn't be upset if the Shazamily got their powers from different sets of gods - it'd just be a lot to remember with the six of them. Haha...
I'm also hoping this means we get a Black Marvel family again, that includes Isis and Osiris...and maybe a new version of Sobek if we're going to have Tawny and Hoppy show up from time to time.
I'm down with Isis accessing her own powers that are separate from the powers of Shazam.
Past that, I'm kind of obsessed with the sixes and sevens in the Shazam mythos:
- they'll be visiting seven magical realms
- the Seven Deadly Sins of humanity
- the Council of Eternity is/was seven in number
- the Shazamily numbers in six human characters (sorry Tawny)
- Sivana, if we get to Thaddeus Jr., Georgia, Magnificus, Beautia, and Sivana's wife, Portia, are six in number. (Yeah, this one is a stretch, but I'd love to see the theme of family play out with the Sivanas against the Shazamily, including the Sivana matriarch. The Shazam mythos could use some more women characters - heroines, villainesses, and everything in between.)