Reach's credit system

Is pissing me off. I did a whole "Firefight" mode and completed it and only received 50 credits. I got 80,000 points in a classic firefight and still got 50 credits. What is this nonsense?

lul.
my borthers been playing all day with his friends he has like 50k credits

That's because he's matchmaking ._.

I don't have it yet ):

yeah that kinda sucks but u get credits from killing the guys dont u it just doesnt show in the overall end of the match crap cuz dont u get like +4 Creds every kill

I score 500 a multiplayer game and like 800 for campaign session

hmm i sometimes get like 2000 in multiplayer

does anyone know like which gives the most creds in the matchmaking

well depends on all the commendations and medals and crap you get but probably something like rumble pit or arena i love doing arena im trying to get into a division