It most definitely is not!
Tim Hornbaker, who penned the very informative and all-encompassing "National Wrestling Alliance: The Untold Story of the Monopoly that Strangled Pro Wrestling pours a lot of research into a very simple method of presenting a wide variety of wrestlers from the past 150 years.
The format is similar to a stat sheet on each entry, mostly following a Career snapshot type delivery. Among the stats are career spans. It's very hard to pinpoint starts and ends of careers in the Wrestling business unless you have access to a wide variety of research sources, mainly a results or match listing record. For many of the stars of the pre 1960 days this is a lot easier said than done. That along with the other facts presented makes this a fine read start to finish.
Also listed in many cases is who trained the wrestler, real names, titles held, and time as a world champion. Many entries I was surprised to see how many titles they actually held, as many parts of careers are notably under-researched or just coming to light in recent years.
Each entry gets a short bio which steers clear of the normal well-known facts and offers a broader defined look at each wrestler
Tim relies on his own research as well as the research of many of the historians of the sport to present a very interesting and formative reference tool that will appeal to both the casual and hard core researchers and fans alike.
I highly recommend this book, you can get more info at Tim's fabulous website http://www.legacyofwrestling.com/