Well, I got to say that this is one of the best books I've ever gotten. Being a fan of Scion from the beginning, I've followed it through to the bitter end and watched some of my favourite NPCs - Donnie Rhodes, Eric Donner - become Gods in their own right.
I do wish for a more resolved ending to the pregenerated series, but they have left the ST much to work with. The Avatar idea is a really good one, though I do wish they'd been a bit clearer in how one can father/mother Scions when they become a God.
That's pretty much all I have to say for now. Love the fluff, tad disappointed with the crunch, but not enough to quit the series.