This is unfortunate context for Scott Snyder, who hasn't written a bad issue in two years on Batman. The dialogue flows, the action is vivid, and his Bruce/Batman has the combination of compulsion and humanity that all the best renditions of the character have had. But Frank Miller's Year One was nearly flawless, bringing Batman from a stiffer, shallower figure into a new era of deeper characterization seen across the comics universe. Year One portrayed a Batman who was – the word has to be taken with a grain of salt – realer than past version. He had weapons that a real crime fighter might have. His Rube Goldberg schemes sometimes failed, leaving him more than once on the verge of death in Gotham's streets and alleys. We imagined him learning to become the masked demigod that Batman would go on to be.
And Scott Snyder's Batman in Zero Year and the preceding twenty issues also has all of those qualities, but that's not new anymore. The effort is serviceable, providing one readable scene after another, but to what other end? If there's a contribution here, it's in the reordering of certain biographical facts. We see an uncle on the Kane side, but what, besides another small tragedy beside Bruce's two huge tragedies, does this add? We see, in the most striking alteration of the legend, a Gotham which is already beset by masked villains, instead of conventional Mafia-style gangs, when Bruce begins his war. That's different in fact than either film series, the previous continuity, or even the publishing history from 1939, although it remains to be seen if this drives some future intrigue.
The greatest potential contribution seems to be in elevating the Joker in primacy in Batman's universe, putting him right at a time of their mutual origin, which was an element, though handled very differently, of the 1989 movie. Coming as a sequel to the use of the Joker in Snyder's earlier Death of the Family arc, it may bookend the character's role in Batman's past and present. It nicely teases a specific identity for the Joker, then throws that promise away, making the Joker now as before, a mystery for Batman as well as for us.
Zero Year is better than most stories we've seen over the years. But in replacing Year One, it has a tough assignment, one that so far serves as a downgrade. It's good. But it leaves, so far, the former as the classic origin, even if this one defines current continuity.