Modern Warfare 2!!

[BP-Revo]

I think that it would be very cool to allow Xbox and PS3 players to play together, but I think including PC's in the mix would throw off the balance.

I find it MUCH easier to play first person shooters with the computer. The most important part is aiming, and with a mouse, once you play long enough, you know that moving the mouse X amounts moves the cross-hairs X amount and you can do flick shots. With a D pad, you have to push the D pad in a direction and wait for you cross-hair to cover the distance over a period of time. This may seem like a small factor but it really would lead to a huge advantage.