Gom, I'm not saying your observations are wrong, but if you're judging UZR based on how much they agree with your subjective observations, then what's the point of even considering defensive stats? The only one that would be any good would be the one that matches up perfectly with your observations, and that point it's useless anyways.
For the record I think UZR is one of the better fielding metrics, which isn't saying a whole lot because fielding metrics aren't nearly as advanced as hitting or fielding. It has its faults for sure, and that includes its judgment of Teixeira. But I don't think three players on one team in one season is enough to discount the stat as a whole.