Yeah, if this was the first BO, I'd say that was legit, but not in BOII.
Either his connection is really dog ****, or he's boosting. (Which I've seen a number of times in this game) In the 3+ days time I did log in BOII, before I put the disc through the shredder, I never came across ONE person that had a KD over 3 on PS3. Not a single one.
In the first Black Ops, 3+ KD was much more common, because the game actually required you to be good.

Comment