If you don't feel like waiting for the 7 on 7 or the double exp weekend events, go play Rumble Pit, Multi Team, or Social Skirmish. I recommend playing Rumble Pit because you can just leave if you do not get odd ball and you do NOT get a penalty.
When you do get odd ball, keep trying to get it, and if it is possible, try and knock it off the map when everyone is fighting for it and grab it when it is placed back in the middle. This makes it much easier to stay alive and try and funnel everyone towards you. It really should not take too many attempts if this happens. I got 2 melee kills after someone threw it over, and my 3rd and last kill came from me throwing constant grenades at it till i saw my chance to grab it.
The below link shows a list of all the matchmaking choices and the game types played in each.http://www.bungie.net/online/playlists.aspx