This mega-mutant crossover packs a lot of neat little moments without delivering a big payoff. By the end, as the dead are being carted off, I had to flip back and remember if the antagonists' motive had actually been explained. It's very busy with characters, as X-Men crossovers always are, but I think it needed a little tightening up. 
 I was going to rate it two stars, but I actually did get emotional over everything involving Jubilee and her son and how it climaxes. 
 Recommendation: If you need to read it to keep up with a series, get it from the library.