I was jazzed to find a code for a golden Lancer and thought... I wonder what this looks like, in-game?
I dabble in GoW multi player and decided it was time to dabble again but to play a Social Game in Horde mode I now need to buy the map packs?  I understand a reason for it but it's complete bullsh*t.  So, because I have no Xbox friends to play in Horde, I need to pay $10 to play with strangers? ...  
 
What is this... a loser tax?  Well f*ck you Epic and MSFT... I'm going to play Modern Warfare 2 without you on my PS3.

No it means you play ranked which doesn't require all the maps. 
 
Social is for people who don't want to drop out to the lobby and find new players because it eats up game time. If you don't care/don't have the maps then you play ranked.