I skimmed Gruber's piece and it was written with the reverence of someone who understands tech and design, as well as something about Apple. The Isaacson book was massive, so I am sure there are some points to dispute or interpret, however I feel it was a pretty good appraisal given some of the interviews of jobs, woz, gates, etc, reading Isaacson and Return to the Little Kingdom, and general other tid bits. I don't think it was a hatchet job at all but a tribute to the man who had been part of making a huge piece of tech and hunan history. It just underscored that with his humanity. I quite liked it, although Isaacson's prose and depth are somewhat trying. Job's really was a social engineer and he and Woz are both amazing individuals.

Edit: just to add, I think Gruber had some valid opinions, but even if correct, don't really discount the larger corpus produced by Isaacson.