Only plus the 360 has over the PC version is that I can sit on a comfy sofa playing on a 50" LCD. Other than that the PC version requires more skill and gives me much more freedom and less chance of getting spammed grenaded to death.
Its exactly the same game you plonker. If anything, its harder to use a pad than a keyboard/mouse setup.
On the grenade front, follow the on screen instructions when a grenade appears, doh! It ain't rocket science