I believe that the 2012 team was a .500 team pre-trade. The majority of the players who have been signed this offseason have replaced players of similar levels of production, with a few exceptions:
Victorino replaces garbage.
Ellsbury replaces garbage.
Bailey can't possibly have a worse season in 2013.
Hanrahan, Uehara and Tazawa are replacing garbage in the bullpen.
Morales and Aceves replace garbage in swing/spot starter roles.
The depth is also better at pretty much every position -- De La Rosa/Webster/Wilson/Lavarnway/Iglesias/Brentz/Gomez will all be waiting in AAA. Maybe Bogaertz, Bradley, Barnes will make contributions. Wright, Britton, Mortensen, Holt, Kalish aren't phenomenal options, but you might get lucky.