I predict 3.5 mln lifetime could be more.
One of the reasons why this game was not as successful as the Halo series is due to the smaller install base of PS3 in NA and also due to the larger number of shooter fanatics being a part of the 360 community.
We have already seen sales for this game to increase since the launch of slim. I am confident that sales will increase even more in the coming months.

It is better to die on one's feet
then live on one's knees







