I've been known to be a Halo-typewad... I've always enjoyed the Halo games. I still remember all the fun my little brother and I had playing Halo: CE for days straight. If this game doesn't cheer me up while I'm down, then I suppose it'll be time to buy myself a N64 to bring back some good memories.
What feature in Reach are you most excited about? Personally for me it's the upgrades to the Forge system and the maps: Forge World and Blood Gulch.