Most of the art in "Necrosha" is BEAUTIFUL, particularly Clayton Crain's work on the first few chapters. The writing's not bad, either, although those unfamiliar with recent X-men/X-force comics (like me) will probably have a hard time keeping track of all the characters.
The first part of this TPB reminded me of Marvel Zombies, without the humor that made that series so distinctive. The Black Queen, Selene, is trying to make herself into a goddess by consuming the souls of countless mutants, and while the remainder of the Marvel Universe vacations, the local mutants are responsible for stopping her.
Proteus also shows up somewhere in the middle of this TPB, though this is one of the weaker spots in this collection. Selene is a much more interesting enemy, and this TPB could have done without much of the filler.
Incidentally, that "New Mutants Forever," which I just read, explains a lot of Selene's backstory, so anyone confused by this TPB ought to check that one out.
As stated elsewhere, I've never been a huge X-fan, but this storyline is well worth your time.