The Mets moved in the walls of Citi Field, which is great for players like David Wright and Jason Bay, who are power hitters that don't hit a lot of home runs at Citi Field. You could tell by the stats. David Wright hit 33 home runs in 2008, when the Mets played at Shea Stadium, the next year, when the Mets moved to Citi Field, he hit 10 homers. Jason Bay hit 36 home runs in 2009 in Fenway Park with the Red Sox. The next year he hit 6 homers with the Mets in Citi Field.
Also, they don't have a bad lineup. Players like David Wright, Andres Torres, Jason Bay, and Ike Davis, are solid hitters. Johan Santana may not be ready for opening day, but when he returns, he could make a big impact. The rest of the rotation is not so good, but they got a few good relievers Angel Pagan trade, which also involved Andres Torres. The Mets are probably not going to make the playoffs, but I don't think that they're going to be that bad.