Straczynski departing from Thor
That's just fine. He went along with Quesada's editorial mandate on Spider-Man showing little to no credible opposition, and made a fool of himself in the end with One More Day, when he remained at Marvel for quite awhile even afterwards. His departure is thus quite fine by me, but comes much too late to convince me that he really had any objections to Quesada destroying Spider-Man's world. And I get the feeling that under Straczynski's pen, Thor would not have appealed to me.
The bad news is that Thor will be swerving into crossover territory after this (it may be called "Siege of Asgard"). But then, that's Marvel these days.