Yeah, there's gonna be some mocking of this, because there's a lot of times when rumble is misused (Psycho Mantis anyone? Oooh, the Rez vibrator!), but it's really great when you don't immediately notice it.

Best example I can think of is Halo. Firing weapons produces vibrations, and when you're in the warthog's gunner seat and taking advantage of the unlimited ammo on the backseat cannon, it can throw off your aim a little bit as your hand starts to go numb...

But, I think I speak for everyone when I say that I will miss the rumble pack, if only because of that whole Rez vibrator thing :).