Scott Summers, annointed savior of the alley cats!
Good: Gillen gives strong characterization to the X-men. Cyclops, Emma, Kitty, Colossus and Magneto are the only X-men that appear in this issue. And, the issue manages to distribute time proportionately among the characters. Gillen's run seems to have begun strong.
Bad: Not necessarily, but the plot twist in the last few pages is a bit risky. It betrays how Gillen portrays the character at the beginning of the issue. It could create for an interesting development.
Overall: I'm excited for Gillen run on the X-men. However, the momentum could be lost as Uncanny goes on break next month, so we'll have to wait two months for the next issue.