I voted Halo.
The reason I couldn't vote for CoD is the move to remove dedicated servers was such a slap in the face to PC gamers that the franchise is dead to myself and many others who have stuck by the franchise from day one.
Half Life isn't current but it is certainly a huge IP and I'm sure when episode 3 arrives it will land on the top once again.
Killzone 2 has one AAA release in the franchise that didn't sell anywhere close to the other entries here, its not in the same league yet as a franchise.
I've not played the latest Battlefield so couldn't judge.
Halo got my vote because I've enjoyed every release from the franchise including the 2 spin offs last year and Reach is looking like the biggest game to be released this year.
All the above is just my subjective opinion, no need to get upset if it differs from yours.








