If you're interested in learning how WAR is calculated, go to Fangraphs and read the explanation: http://www.fangraphs.com/library/misc/war/ Baseball Reference does WAR a bit differently: http://www.baseball-reference.com/about/war_explained.shtml If it's a debate about its value, you might google it...there are dozens of articles out there discussing the subject. If it's opinions from TD'ers you're looking for, my personal opinion is WAR is so flawed as to be worthless. I am probably in the minority with that opinion. One minor point about the question you pose in your last sentence...WAR isn't intended to be predictive, it's intended to be a record of what happened.