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"I used to want to be pro-life but then I realized I didn't like guns, torture and war enough." - @LOLGOP
UZR is more flawed than OPS or wOBA and actually a few other hitting stats. It's a nice stat, better than eyes or media, but it's certainly not as good as a lot of hitting stats as it's far more difficult to actually quantify defense completely.
We'll only really know how good UZR is once this new system comes out. Until then it's a yard stick, but it's impossible to show if it's even close to as accurate as OPS or wOBA are for hitting because, well, you can't do things like find it's correlation to runs. You just have to trust it. So again, we'll see how UZR stacks up when this new system is unleashed on the world, but until then it's a nice tool but not even close to gospel.
And then. He made them pancakes.