Scion: Hero is a book with serious lights and darks, and in a sense it never really reaches its full potential. For one thing, it keeps the lore of the second edition, which makes no sense in any way, as I commented on Origin. But also, a lot of its pages aren't really well used, as it seems like most of it is redundant. A full character creation chapter, for example, was unnecessary, given one was already in Origin, and it could be summed to the part where you update from pre to post-visitation characters. The fact that ten pantheons are added in this book is good gameplay wise, but also means that a lot of pages are spent on very basic depictions of the pantheons and, thus, information that is more or less easily accesible with any quick online search.
The gaming system also has lights and shadows, though in this case lights may be a bit stronger. Some ideas are better than those in first edition, some are very different and I'm not able to judge them right now, and some are worse. Birthrights have been improved a lot with much more flexibility. Purviews and Knacks work in different ways but it seems like they should be better now. But Paths bring character Classes (like those of D&D) to a game which is something some of us don't like, and the new virtue system is highly debatable. A lot of other things, I'd need to run a game to test and see how it all turns out.
As a result of all this, I can't say the book is worthless but the fact that the background is so much worse than in first edition means that the game suffers a lot.