It is true that all of us could look at a basic stat sheet and predict wins/losses for next year. In fact, I could just take every team's W/L record from 2009 and add 0 or 5 wins to it and come fairly close for 2010. If every GM can do that also, then there is no way to gain a competitive advantage if everyone knows the value of basic stats. However, if I am looking for free agents to sign and I only have a small budget, it might be useful to find a stat like WAR to combine with more traditional player evaluation in order to gain a competitive advantage. Maybe WAR is not the answer, but it is important to continue developing/researching statistical methods.