I notice a lot of people saying their stats have been reset or rolled back but the kills they got with the guns and scoresteaks remained the same.
I would like one of you people with this problem to do this test for me. When you want to quit playing bo2, back out to the main menu, then either hold the ps button or go to the xmb menu and click quit game. Then turn off your ps3. I always do this and I never had a problem with my stats.
I believe people's stats are getting reset because they are not quitting the game correctly. IE: just turning off the ps3 while you are still in the pre game lobby or in the middle of a match. ( I am not sure if this works and I might be totally wrong, but I always do this a never had a problem.)