I think Freiberger made some mistakes, but he's been unfairly demonized. It's too bad he couldn't contribute to the book, though. Since Herb Solow left near the end of season two, and Bob Justman left half-way through the third season, the picture of that last year it presents isn't as detailed as the book's description of seasons 1 and 2 (as well as both pilots).
I agree, I would have loved to have read his detailed insight on doin gthe series. Would have also loved to have met the man. By all accounts, whatever one thought of him on the job, he was a hell of a nice guy.