I didn't make it!
This is what I am doing: (yes i am pressing start game)(im hooked up directly to modem) 1.Got to optimatch 2. Pick big team battle wait 30 min. 3.pick team skirmish wait 30 min. Im not using a router 4.pick slayer wait 30 min. 5.pick head to head wait 30 min. 6 pick any other game i missed and wait 30 min. And it never finds any matches I have never played one game on live optimatch and quickmatch never find games on my other games either. I tried joining a freinds party and it says you could not join this party because we are having network difficulties sorry about that. When someone tries to join my party it does the same thing i called xbox support but they weren't any help.
Whats you Upload and Download Speed. Also, check your bandwidth.