Overall, the book provides a good overview of the evolution of the genre detailing the early use of university computing resources for covert sessions of SpaceWar, Adventure and Colossal Cave thru to the emergence of the Professional Gaming League.
Where the narrative starts to get bogged down is when it gets to Richard Garriott (aka Lord British), the creator of the Ultima series of games. (For the record, I'm a huge Ultima fan - the original Ultima packaging, with a knight on a black warhorse facing off against a dragon emerging from hot lava, was the reason I bought my first computer.) Once the authors get to Garriott, the pace slows as we explore his life in extended detail from his early family life to the release of Ultima Online. In contrast, significantly less time is spent on the other pivotal computer games like Doom, Half-Life and EverQuest. While I'd be the first to point to Garriott's role in the development of this genre, all roads don't necessarily lead to Lord British.
Net/Net: Decent overview of a topic that has often been eclipsed by the more glamorous console videogames industry. Would have appreciated less detail on Garriott, and more on the other games.
Full Disclosure: Reviewer works as a marketer for Windows and Xbox games at Microsoft.