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I use most of the sabermetric measures noted above (I hesitate to call them "stats") as well. I probably use ZR the most for fielding. But it is never just one or two things. It's a mosaic of several factors all evaluated at once.
IMO, one of the most important things to do in stats only is to contextualize the data (if that is even a word). You can't just say player X has a +1.05 ZR in CF and say he is really good. I find it helps to really understand the circumstances. How are the corner OFs defensively? Does the rotation have a lot of fly ball pitchers? Is the ball park huge? All metrics have some limitations. Understanding the limitations and evaluating X in the context of Y is very helpful. Of course, this takes a lot of time, hence stats only can also take a lot of time.
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