No, pitchers are paid to get outs. they contribute to a win. GMs don't contribute to putting the team together, they do it. The only goal of putting the team together is to win as many games as possible. Thus, wins are the best measure of success. What factors are out of the GMs control? Certainly luck plays a role but each move carries risk that can be evaluated. Over a long period of time, the role of luck is reduced to appropriate evaluation of risk. Poor GMs will be hurt more by bad luck than good GMs because they take bad risks. As is well-documented on this site, wins are not a good measure of a pitchers performance. runs prevented is a much better measure because it is more within a pitchers control. Really, I find this is a very bad analogy. Being a GM is not comparable to being a pitcher.