I am enjoying the hell out of Spec Ops Survival, solo or with partners. No lag! Set up a sentry minigun and a sentry nade launcher with overlapping fields of fire, guard them from close flankers, and run them indoors with the little birds show up. Hella fun, except when there are three choppers and three juggernauts.
Last night I accepted a Kill Confirmed invite from bap and Angryman. Started playing a subgun class with Quick Draw and topped the leader board at least three times despite my three bars. MP7 kicks ass.