For me personally, i started counting hopefull of getting it dead on 200, but i can safely say its very unlikely this will happen. I also recommend not keeping count either, even if you think its a good idea, it will grow to taunt you. it took me over 600 games, and putting a line after every game just drives you insane.
Now if theres anyone that is actually still in for the long grind, there is a very easy method to boost it which takes about 3 minutes per game including loading times.
You will need a party of 6 minimum to start up games. One person must host, set it up on the map 'Den' with creature density on high, animus limit of 100 and alpha werewolves on.
Blue team will win every game just because it is easier that way. One person, from spawn, run down the corridor and jump down the trap hole. When you hit the floor turn left and walk forward about 3 metres and look up, you should see an alpha werewolf drop from the ceiling, Kill him and suck up the animus using 'Y'. Now do a full 180 and sprint using the 'LB' towards the animus machine, the first corridor on your right should take you there, drop down and hold 'Y' to fill the machine and there you go, one game done, 599 to go...at least...
Best of luck guys :)
Oh and it makes no difference if you win or loose or anything like that, though i would suggest watching the cut scene and press 'A' and 'A' to leave, not 'B' and 'A'