what i think a lot of people dont get is that these are still just stats. without the objective knowledge necessary to make these appropriate objective conclusions, "fancy stats" are becoming just another de facto source of subjective opinion.
if anything, im incredibly on the "left" as far as fancy stats go, probably more than most of you, in a way. i think that developed properly they can begin to start make legitimate and game changing objective conclusions about players, similar to WAR or another advanced stats in baseball (although not to the same extent, just the same objectivity). but it requires actual statistical analysis, not something an amateur can throw together in a message board post.