Light at the End of the Dark Age
From all four of these WildC.A.T.S./X-Men crossovers, this is the weakest. Which I am surprised since it is Warren Ellis. Ellis help make his name at Wildstorm and he is one of Marvel's top writers. Another shocking thing is that Ellis writes good cyberpunk. With this "cyberpunk" like atmosphere and characters he knows, this should of been a cake walk.
The Major problem is that the Wildstorm characters just don't work well in the Days of Future past atmosphere. Ellis at times is really wordy and the story at times seems unfocused. There must of been a creative battle between the story he wanted to tell and the need to wrap up this mini-series of stories.
If you are not familiar with the WildC.A.T.S. then this is not a good book to read, even if you like Ellis. This comic is very dependent on the rest of the series. The ending is only satisfying if you read the stories before because Ellis writes reference to past interactions between the WildC.A.T.S and the X-Men. If you are reading this story only because you like Warren Ellis, then there is high chances you won't be satisfied.
My problem with this comic was the character design. At the time of this comics release, Ellis' crown jewel Transmetropolitan was still young and was leading his creative drive. Some of the costumes in Transmet are odd and this comic victim of the same futuristic look. I did enjoy the transmet designs, but not so much some of the designs in this book.
If you are going to read this book, read it as an entirety with the other three stories in WildC.A.T.S./X-Men.