quoted from FourZeroTwo

@sean_armstrong It's related to the servers being down at the moment during an upgrade. It'll be fixed when the servers come back up.
2 minutes ago from web in reply to sean_armstrong
@T_Rux That's unrelated to the patch. They are adding more bandwidth servers to meet MP demand. The Patch was for SP only.
3 minutes ago from web in reply to T_Rux
#MW2 PS3 Status: Patch successful. Trophy Unlocks on PS3 now available in Single Player & Spec Ops. Adding more servers to meet MP demand.

they're adding more servers asap, cant blame em, yesterday there was almost 300,000 people online