Could have been a much better book, ends up being more about the personalities surrounding the 2012 - 2014 Pirates attempts at leveraging statistical analysis and basic machine vision to help improve team performance, vs the actual science and techniques itself.
Central in this story is 3 people, Russell Martin, the undervalued free agent the pirates procured during their storied 2013 run, Clint Hurdle, the team manager, and his (soon to be) team of statisticians, starting with, and led by, Dan Fox, who headed the small Pirates analytics/IT department.
The major tools that came out of these efforts were the infield shift strategy and the discovery of pitch framing. I was not very well convinced on the profundity of these two insights. That fact may be the result of my relative lack of interest in baseball as a sport (although I did take a short course on Sabremetrics a few years back). What I don't understand is why no one had experimented with changing defensive field configurations in 80 years? Like with Moneyball I'm led to believe this has a lot to do with the ossified culture of most front office clubs. As a result, Baseball seems like a fairly stagnant game up until the past few years, almost ritualistic.
Also, the author does a poor job of recounting much of anything of the actual techniques which went into the Pirates' analysis. The reader gets that it starts with doing counts of typical trajectories of hits, but the explanation doesn't go much beyond that level. From my understanding of Sabermetrics, the key insight was to understand which metrics, batting averages, OBP, slugging percentages, ISO, strikeout rate etc., were actually linearly correlated with a target of interest, say runs scored for a given team, then to construct metrics from these means and percentages, like Simple Runs Created, that could possibly capture the underlying functional relationship between your target and your metrics. Thus, the real insights of Sabremetrics can be recast as a matter of feature discovery and feature engineering from a modern machine learning or data science perspective.
The key value of Moneyball was that its practitioners were able to discover the subset of valuable metrics from those that were dross and wrap them up into something both nicely understandable, and predictive, like a multiple linear regression. Unfortunately, Big Data Baseball doesn't go much at all into this level, thus the reader doesn't ever feel the full weight of impact of the technique or the toils that went towards constructing them.
The book hints at a more interesting thing in the last segment of the book when it discusses ways data could be utilized to predict professional performance from high school performance, or forecast body morphology and development, but only in brief. Another thing, the title is a misnomer, as none of the analysis recounted in this book would constitute "big data" (something that could not practically be done on a single machine). Perhaps the data from the PitchFX system, but even this amounts to extrapolating flow fields from a video, something a software like Matlab could do on a fairly powerful laptop.
Wish the book went into much more detail, recommended if you are a Pirates fan.