-This is my method for easy matchmaking commendations:-

Here it is short and sweet:
1)Get a total of 4 controllers for you and a friend. (You can have another friend with you but i choose to only have one other person helping so my k/d does not get affected negatively)
2)Now sign in all guests and have your friend do the same.
3)Look for a living dead game and try to only vote anything but safe havens.(You will waste ammo and take a little bit longer to kill zombies.)
4)once you get something like save one bullet, start killing all of your guests once they are all zombies. See more on this step below.
5)Every round take turns and enjoy, and remember to look at what commendations you want to get up before each match like Assassinations and such. See more on this step below.


Step 4 (in detail): Ok, once you vote a gametype you will start the match up. Once you get in game, look at your guest screens to see who is infected and who is not. Now im going to base these examples off of only 2 human players (6 guests) to give you a better picture. So once you look at the screens, check to see what your friend is and his guests. Now let's say you are a human and your friend is a zombie, have him infect (kill) your guests that are human quickly to give you more time to kill zombies. then have a guest that is infected on your controllers, and go infect his human guest players. So now everyone is infected but you. Now if your friend doesn't care about his k/d (unlike me), then that means one extra kill is in play which is good. So now kill any infected zombies you see. Try to kill them specifically at first so they all spawn near each other like they are suppose to. So now after you have done that, go and :arrow: the shit out of all the zombies in the spawn (in this case there should be about 7). After you kill all 7, you notice you get like 80-100 cr or more for the killamanjaro and you probably earned a killing spree too (no shit sherlock)! Then, go to the next area you see them all at and kill all 7 again! Now once you keep doing this you will start to see a pattern in the spawning. A map that racks up serious kills is the remake of Halo 2's ascension. That map i usually average about 120 kills a round out of the three. Use ammo sparingly and make those headshots count

Step 5 (in detail): Basically, whoever is infected first is obviously not going first, since he can't do the killing. So this means it is your turn if you are the human. Get all the kills in the world possible then after that round, it deserves to be his turn, since he had to sit out last time. Another scenario, what if we are both zombies?, well that means you just kill all humans to quickly get to the next round and not sit around doing nothing. And one more, what if we are both humans?, well, this is your choice you can either split up the kill and go 50/50 or just have one person let the other that round get all the kills (especially if that person had to sit out the next round). Just try and give everyone a fair amount of kills and turns and try and gladly earn many Cr!

Let me also clear this up with some people nervous about a ban, it cannot happen! They have no proof you are cheating because what if your guests actually suck that bad? And also, i have been doing this for 6 months and have not gotten banned yet!!!

I hope this helps anybody wanting to find a good way to boost and be perfectly safe!
(Thanks to your man ii Get DiiRTy X)

Any questions just msg: ii GeT DiiRTy X

(UPDATE)-
With the new playlist updates for May 16th, 2011, you can now have a maximum of 12 PLAYERS! which means, you guessed it, MORE BOOSTING!