Long before Joss Whedon gave us the phenomenally successful Avengers movie he wrote for Marvel's other high profile team, the X-Men. It was a risk, for both him and Marvel. Despite the fact that he'd spent much of the previous decade showrunning juggernaut TV hits Buffy and Angel, as well as the decidedly less commercially successful Firefly, Whedon was an unknown quantity in comics.
Whedon and Cassaday’s Astonishing X-Men is a lovely looking piece of work that demonstrates everything you’d expect from both an X-Men book and something written by the man who brought you Buffy the Vampire Slayer. Reading this it’s clear he’s a fan of comics and Marvel in particular. If you can put up with a fudged ending it’s well worth a look. If you’re already a Whedon fan then you won’t even be bothered by the ending: you’ll enjoy the series regardless.