Ron Hogan: It's a given that the litblogosphere has it in for Sam Tanenhaus and the New York Times Book Review, with this blog counted among the critics. But I like to think that the 'Cat has been supportive, albeit in a rather tough-love mode, of the changes Tanenhaus has executed in nearly three years on the job. But nestled among such successes is a columnist whose faults have become more glaring with each new effort — science-fiction reviewer Dave Itzkoff.