Which joint affects overratedness?
He's not the answer to all the Mets' woes, but just like one good player signing by us isn't the end-all. He's a good player at a position they really needed to upgrade, so it's a good signing.
That being said, he's a poor fielder and Citi has a lot of ground to cover, he'll be a lot more exposed than he would be in say Fenway. However, he's a dead pull hitter and so his power won't suffer like gap hitters would. Kind of a mixed bag.