I never knew you had to sign up to play their games. Seems crazy.

I play Halo for the campaign I played the crap out 1,2,3,ODST,Wars, and Reach but for multiplayer I wasn't really into Reach it was ok but I couldn't play it for a really long time like the other Halo games but hopefully the fourth one would make me play it for hours and I'm really looking forward to the story and for the mecha I saw in one of the multiplayer maps I wonder if you can use that in campaign or something because that would be interesting to use.