Defensively he has 81 assists in his six seasons which is pretty good (in fact, I read that it leads all of baseball in that time period). He's not going to be Bloomquist out there and given KC's pitchers flyball tendencies this is a good thing. An outfield of Gordon/Francoeur in the corners and one of Maier/Dyson/Blanco in CF would be quite athletic.
I'm not going to defend the signing to those who bash it because I understand their point. But I always assumed Moore would either trade a highly rated prospect for him or sign him for an obscene amount of money, neither of those happened. So this appears to be a mostly harmless acquisition in my opinion. If it works, great! If it doesn't then he goes the way of Jacobs and Ankiel (meaning elsewhere).