This is what drives me nutso about WAR, and dWAR in particular. There has to be a formula for determining what a replacement player is and essentially nobody knows what it is. We don't even know the benchmark.
In addition the formula for calculating WAR is so long-winded that again essentially nobody knows how to calculate it. For all we know someone may be just throwing a bunch of numbers at us and we (or some of us) are buying into it.
And I don't care what anybody says, when someone is rating something the result is subjective.