Like many comic book fans, I'm suffering from acute crossover fatigue, and this one didn't do anything to cure me of it. 
 I was moderately interested because it seemed like it would address the fact that it's starting to feel like the mutants and the other Marvel characters inhabit completely separate universes. (Except for when crossover time rolled around.) It's got a decent set-up for a conflict between the two teams. The Phoenix force is on its way to Earth to bond with Hope, the only mutant born since the Scarlet Witch put the whammy on them in House of M. Cyclops thinks Hope might be able to manage Phoenix to reboot the mutant species, but Captain America thinks that leaving the fate of the world in the hands of one mutant girl might be a tad dangerous and wants to take her into custody. 
 That's a valid reason for conflict between the two teams, but the whole thing quickly devolves into fight after fight that becomes a big messy smear of a story. One of my biggest problems was that I'm getting a little tired of seeing the Marvel heroes fight each other. Civil War featured the good guys choosing sides. House of M was essentially about Scarlet Witch going nutso and rewriting the universe. While Fear Itself had a couple of bad guys, it also featured some of the strongest heroes being brainwashed and fighting the others. This whole thing about hero vs. hero has been done so much recently that it doesn't seem remotely fresh. Aren't there any villains left with evil plans? 
 A major character death at the hands of another might have been shocking and had some impact if the murdered character hadn't died multiple times already and if there was any real sense that this would have permanent consequences. But considering this happens in a story concerning Phoenix which is returning for the umpteenth time, it doesn't really seem like it'll matter.