The thing that really grinds my gears about Halo that never popped into my head until I played Call of Duty 4 was there is no sense of reward if your team loses the match. You could be game MVP but because your teammates suck you are penalized not rewarded for doing better then they did. There is also nothing to reach for other than level and rank. You are playing for your 1 EXP or for your level to increase, nothing tangible. No new armors or anything just a number.
I'm hoping Reach has a more rewarding experience system that actually takes into account individual performance not just oh your team lost you get no EXP and went down a level. And somethng to unlock, maybe customized weapon loadouts/equipment set ups. Its not 2001 anymore, Halo is the only shooter left where you go into a match naked and have to find your weapons or have your weapons picked for you.