4.0

It's dense in the best ways but in contrast to say Pete Palmer's book or The Book or things from the baseball prospectus guys, this seems or feels less "you can put these theories into action and run your own simulations with this baseball math" and more focused entirely on recent baseball history. Still does things no one else has like giving you GM evaluations and other methods to reflect on how to measure what teams are doing well over a period of time.

It's well done, just very different and I'm not sure precisely who the audience is.