Four of us were playing some of the multiplayer modes in COD:AW last night. Myself, @ANiMOSiTY, @Skeeb23 and RhavinX. Skeeb was hosting. Despite that Skeeb is in the US, I can’t say there was any time that I noticed any particular lag. I don’t think it makes much difference in Exo Survival (Coop, max 4 players), but I didn’t notice any lag in particular when playing some Free for All, either. I think we finished playing at around 02:30-ish this morning.
For what it’s worth, the game is very very pretty, and the amount of detail in the maps is incredible.
Exo Survival starts with 4 available maps (Tier 1). In order to unlock more maps, you need to complete 50 rounds across as many games as you like on Tier 1 maps. Note that it says ROUNDS, not games. So if you survive 25 rounds each in two games, you’re covered. I think my best survival rate in a game was 12 rounds so far. 
[s]A caveat: I don’t think private matches count.[/] Private matches DO count. Even Solo.
To unlock Tier 3, you need to play 75 rounds on Tier 2 maps. And to unlock Tier 4, you need to play 100 rounds on Tier 3 maps.
@Ingeon - I see this is on your wishlist. If you want to pick it up, it is currently $39.59 USD, offer ends in 31.5 hours.