I'm glad somebody brought this up. Rather is no Cronkite, Murrow or Brinkley: the Killian documents debacle demonstrated that he was sloppy at best, and was more interested in pushing a political agenda than digging for the truth. That's the antithesis of science.
This doesn't invalidate the need for climate change research -- not by far! -- but he shouldn't be the poster boy for any fact-based cause at this point.