I will buy a XBOX 360 FPS game for my brother for Christmas. Because we play oft together, I would like to buy a FPS which supports co-op offline playing. We have had a lot of fun with COD MW2, COD World At War (a little bit frustrating that it didn't save our progress in co-op mode though).
I am looking into a series of lists, but the problem is that they always consider online co-op, which is not what we want.
Do you know any lists of Xbox 360 FPS games with offline co-op mode?