I think some of the confusion with this argument is that, as Yarnivek said, WAR and FIP are like the QB rating system. They aren't "statistics," though their formulas are based on statistics. And as has been pointed out by others, it's how the rating system's formula is comprised that is "subjective" to an extent. However, it's not that "subjective" formulas are inherently unreliable. Rather, they are as reliable as the person on whose expert opinion we rely, and the data that they are using. Even without diving deep into the composition of the formulas, we can look at different formulation of WAR, for example, and determine which outcome most closely aligns with what we believe reality is. I prefer not to use WAR at all, because I believe it is generally used by people who believe it is authoritative, like a statistic, proving definitively how one player is better than another or how one player's season or career is better than another player's season or career. I think it's a lazy way of making an argument from authority, without really knowing much about the authority. And it's also not the correct way to use these rating systems, which are really intended to be predictive (attempting to equalize things like luck and park factors) and not a reflection of what actually happened.