Don't play angry.

The old saying "cooler heads will prevail" has a lot of truth to it.
If you want to do well in this game your best bet is to remain calm and have fun. First and foremost, its a game. If you're getting too pissed, just put the controller down and walk away for a few minutes.
No point in staying upset over that death 3 games ago, just take it and forget it. Its done, no changing it now.
So instead of throwing your controller or punching some nearby object, go to your local dollar store and buy one of those kids punching ballon things and punch that all you want when you get mad. That way you don't hurt yourself or anyone else.
Note to Activision: sell some COD punching bags.