I understand your point, ORS, but adjusting it on a logarithmic level would eliminate many of the statistical deviations. Since the data itself is very limited, the variations are great.
Conceptually, I understand it. However, it's application is very limited.
Case in point...an established player, say a Jeter, or a Drew...his offensive numbers will basically stay the same with little variation. Similar OPS from year to year, with little deviation. However, looking at Jeter, there is major deviation in his UZR. This makes no sense to me. There is an element of luck in a players batting average. Things tend to even out over time, but one year..hey, those bloops find holes. With UZR, this variation is more or less the norm, not a deviation.
I believe that there is less of a deviation for fielding on a year to year basis. You don't suddenly lose the ability to track fly balls, or the ability throw across a diamond. It deteriorates at a much slower rate, than say, the ability to turn on a fastball. This is one of the biggest problems I have with it.
The concept may be linear, but the effect is not linear IMO. It's logarithmic in it's application. It's not that I do not thing that a fielder should not get credit/failure. He is limited to the amount of plays he has an impact on. The number of plays should be factored in when determining a players overall defensive impact. Currently, it does not.
Not to mention that the statistic is mathematically flawed. I just don't see why you accept everything you read without question.