To my surprise the multiplayer just seems flat out broken. Every time I logon to MP my modules unlocked are all reset, along with anything else I might have unlocked like dog tags. That's if I don't get disconnected randomly.
Connectivity issues are huge here. I was very lucky to be able to finish a whole game once or twice. As far as online is concerned this game has been nothing but painful and disappointing. At this point I've simply given up. It's really not worth my time and energy to keep searching the web in hopes that I'll find a fix for this ridiculous problem. Imagine if Bungie (or any company these days) released Halo (OR ANY GAME!) and the multiplayer was broken... It's embarrassing.
It's just sad that the gamers get the shaft like this every once in awhile. Had I known I would have not paid the price until they got their stuff together.