I take that back. I have the gun, i have the mappack, but everytime the game loads into any of the new maps, the PS3 freezes and needs a restart.
Also, when i go into the ingame store i get disc read errors (58 and forgot, maybe 7) and the PS3 freezes as well.
Essentially it does not work at all.
I played before in a party with someone without the onslaught DLC and that worked.
So, clearly the DLC is flawed.
Folks from IW and whoever earned money with me buying the Season Pass; Fix it, and fix it FAST!! PLEASE!!!