This is basically the book I wished for when I was considering if I wanted to join the Episcopal Church. As someone not raised in this tradition, it's all very confusing and a bit overwhelming. This books gives a great outline and base to start from when trying to sort all of it out. Notably, it's not just the definitions-- this book includes a crash course on Episcopal theology, history, and thought that highlights what is the commonality that distinguishes it from others.
That said, the geek thing is a lot forced sometimes. As geek myself, I really felt it when the comparisons worked, and they did, a lot of the time-- but it's more than a bit self conscious other times.