This was great. After a couple of rough chapters over the last couple of weeks, Battle of the Atom ended exactly how it needed to: with a believable status quo shift and with a whole plethora of new story opportunities. I say "shift" because most of the things revealed weren't these massive, over-the-top, "the world as you know it has changed!" moments. They were natural progressions of where both the crossover story, and in most cases where the individual titles' storylines, had been heading.
What is most interesting to me is that we're really seeing a shift in the focus of the overall X-Story. Since Avengers vs. X-Men (without getting into the whole "Cap vs. Cyclops" argument), the presentation has been one of Wolverine as the legitimate Mutant leader, while Cyclops was the rebel and the morally ambiguous one. But over the course of this crossover, and specifically this issue, the reader has been forced to see that, just maybe, Cyclops knows what he is doing and Wolverine has not really become the paragon of virtue that the world seems to want to think of him as. When the shit hit the fan and the Jean Grey School was under assault, who was it that came a-runnin' to help? Cyclops. Who was it that was willing to give Jean and Young Scott sanctuary when it appeared that the best course of action was to send all the Originals home? Cyclops.
Let's face it: Cyclops came out of this smelling like a bouquet of roses and Wolverine kind of looked like a chump. More importantly, the fact that the Originals have elected to go with Cyclops has passed the mantle of legitimacy to the Uncanny X-Men. This opens up all kinds of interesting story opportunities that I can't wait to see.
Speaking of which, I actually really liked that this crossover did *NOT* wrap up every single plot line going. The Brotherhood (lead by Xavier) is still out there. SHIELD has its own sentinels. Kymera is staying (pretty much telegraphing that she's going to be in Uncanny X-Force) behind. There's a lot that was introduced here that is going to be around for a while. And that's what a crossover should do; set up new stories, not just new status quoes.
Battle of the Atom was fantastic. I still say Second Coming was better in terms of X-Crossovers, but not by much.