I thought Morrison's run was the most innovative and exciting vision of the X-men since Claremont took over. He validated the X-Men in the modern world in a way no other writer has. From Kick, to the huge young mutant population ALL OVER THE WORLD(a nice mix of peoples), X-Corporation was perhaps the greatest zenith of Xavier's mansion idea, Cerebra, Cassandra Nova, his version of the Shi'ar, the silent issue in Xavier's mind, all these things and more showed Morrison's ability to mature the concept of X-Men in a way no other writer ever has.
Whedon's Astonishing is his version of the Claremont/Byrne golden era, as is pretty much every other X-writer, from Lobdell(who really just glided on what Claremont had set up, nothing innovative, save perhaps his mildly amusing Generation X(at least the first few arcs...), to Alan Davis(though, in his way, at least his run was enjoyable, if not contrived) and everyone in between.
I think its truely horrible that the x-editors messed with Morrison in his final arcs(Jean's death, per example), and then went about erasing all the innovations his run accomplished(mutant pop culture, X-Corporation, student body of hundreds, etc), with of course M-Day effectively destroying the concepts of humans actually being the endangered species with an expiration date of a handful of generations and mutants actually surplanting as the dominent species in droves of the millions.
My only wishes of his run were that he's incorperated Storm into the saga(I would love to see his vision of her, beyond that Genosha issue), and that Xorn had not been Magneto, but rather stayed on as a very powerful, very Zen, Chinese X-Man, which there never has been(save perhaps Jubilee), and considering that's the most populous country in the world, one would imagine there would be a lot of Chinese mutants doing their thing(Indian too, for that matter, there's Thunderbird and ?)...