That quote/article that a fellow freak posted is old, the new report is that Whedon isnt really doing much, he is just adding the finishing touches, and that zack hand picked him too do it. So regardless how much people hate zack, he and Whedon are friends and they respect each others work obviously, otherwise whedon wouldnt have been chosen to do this nor would he have accepted the gig. Also he is getting writers (screenplay) credit not directors credit. WB is just trying to honor him for doing this