Right then, have the maps, played all except the zombie one
My thoughts:
Kowloon - Damn, what a confusing map, its night, peeing with rain and so many places to go and hide 6/10
Stadium - Bloody brilliant, fairly small map, shame you can't get on the ice rink

9/10
Berlin Wall - Looks great, just don't cross the RED zone into no mans land

big map loads of buildings to go in on both floors 8/10
Discovery - Snowy map, nice addition with the bridge you can blow a hole in meaning you have to jump the gap and lots of hangers and smaller building to go in 8/10
All in all, a good DLC, and for XB owners its double XP points this weekend!!

See
HERE for the map pack video