I just got it yesterday.
Thus far I like Extinction a lot more then I thought I would.
As for MP playing with randoms is fucking horrid (as is the norm), so I haven't really played it.
If any of you COD guys would like to play send me a FR or invite GT: Arventis I'll do MP and Extinction. (Note that I am VERY rusty as in not playing a COD in about a year)
I have NONE of the DLC, just the base game.