Chossudovsky's come off pretty well on the whole. He has a good big picture and thus a sense for details that matter.
I don't agree with the assertion that cell calls were impossible (as this is unprovable, and if you look at the published records very few supposed cell calls connected for more than a second). However, there is a world of difference between that and Griffin's positing an alternative of voice morphing (also for the NORAD tapes!) that he then pushes at every turn.