I'll try again with defense: 1. The measure is inexact. This isn't really in dispute, the people who designed UZR admit as much. It probably has some value as a snapshot, but the exact numbers cannot be taken as exact, especially in small samples, but also to any samples smaller than three full years. 2. The second problem is how it is quantified and measured on par with offensive stats. This is not defense has no value, it certainly does. But, it is problematic, in light of the previous point, to try and quantify defense into a value that can be compared to offense with any sort of reliability. This also doesn't take into account outlier numbers, especially in corner positions, or the fact they really don't know how to properly quantify catchers or 1B. Defense just seems to factor in so much more than offense - such as teammates, pitching styles, shifts, etc. These surely skew the numbers, especially in smaller samples of a season or less. To answer your questions, I would pretty much get rid of WAR as it is currently construed. I would keep defensive, offensive and baserunning statistics separate and to be judged on their own merit. I wouldn't get rid of UZR or other defensive metrics, but I would keep hammering home the point that they are best as snapshots and ranges, not definitive ranks. And I would especially be leery of any efforts to quantify them into the same common value as offensive runs and then think it is a definitive stat. WAR is probably the *best* measure only in the sense that there are no others. But it is seriously flawed and doesn't us much without looking at many other stats. There is value in comparing across positions and across eras, but that is a quick measure that should not be seen as definitive.