Armor Lock isn't overpowered. You just suck at Reach :)
Reach isn't bad, you're just a BK :)
For my gamertag, look up "Ghoulishtie"
Everyone has been telling you the answer! LEARN TO READ!
ODST comes with 2 discs.
One has the new campain, and co-op mode: Firefight.
The other holds everything up to date about Halo 3 multiplayer. Map packs, weapons, armor, etc. Everything is EXACTLY THE SAME! (execpt of course, the 3 new mythic maps)
The only gameplay that you experience as an ODST is the campain, and co-op (except playing as johnson) Multiplayer will still be spartans and elites ONLY
[Edited on 07.02.2009 12:43 PM PDT]