Thoughts on "Think Like a Grandmaster"

I read this book many years ago before computers when it had a great reputation as one of the handbooks for the Soviet School of Chess. Recently, I've noticed that it's been criticized for requiring a person to analyze each move in tree like variations. My own experience after I went through all the exercises and read the book twice, my rating jumped from 1980 to 2220. I hadn't studied tactics or openings that much before. Previously I was just going through well annotated games trying to understand middle game plans and read a few books on positional chess. Around 1800, I bought some books on the modern defense so I had an opening I could play against anything and I would just double fianchetto as White to avoid any serious problems in the opening. Has anyone else read this book?