Hey guess what!? I play CoD more than Halo, but I'm not an annoying fanboy. I love CoD more, but I like how involved the Halo Community is...
Here is a fun little idea I like to do when I play Halo 2 occasionally. On the Outskirts level, grab the Sniper from Johnson and usually he'll say " Oww That hurts chief" Then go to building where the turret is, and behind it should be a dead marine with a pistol. Grab it of course, then if you know the glitch where you jump on building from the Start (and can move to the next checkpoint, optional). Then go climb into the high buildings. Then when the jackals come began your Romeo(ing?) like in the ViDoc. Also it fun to go the whole mission just with the Sniper and pistol, until you get it take in away via the Metropolis level.
Just my way of getting in the odst mood.
So try it out, and tell me your odst in halo 2 tactics and Strategies.