Really? I wanted to feel the bumps in the road in MotorStorm since I thought it'd give me an indication of how the car is riding on the road;
Yes, because of the physics I have all the visual feedback I need, especially in first person view. If you raced with the truck, the rumble has even less value. I forgot about rumble since I bought a PS3 until some guy here posted a question and ask how it's like. I think you should be able to find the thread here.
I don't think road feedback is useful at all (It'd be on most of the time). On hindset, the rumble may be useful in indicating overheat. But after a few races, I already learned to watch the temperature while boosting. Kept my eyes busy (like in real driving), but not too big a deal.
I felt the lack of that feedback was an overall detriment. Resistance not so much, though I would have preferred that rumble be tied to health, since I died a few times simply because I didn't realize my health was low.
Yes that would be nice, but like I said I didn't realize it was missing. I may be easier to help new players learn the game.
In Resistance, things happen so fast that I'm not too sure one can react in the heat of a battle (When you try to retreat in a firefight, you will most likely be defeated without killing your opponent(s)). When you're fighting with a team, then you may have a breather and can break away *after* a fight to let others move on first. But then it would be natural to check your health after a fight anyway (with or without rumble).
In a fight, all my attention is focused on the opponent's head and keeping up with him/her (you'll need to adjust the gun-sight level and pace), L1 use (alternate fire) plus L2 use (speed up/rage mode), because this is how one can out-maneuver opponents in a skirmish (e.g. increase the speed temporarily and circle behind them, improve chance of headshot, timing grenade and secondary fire use, ...). It is natural for me to forget about Rumble in Resistance (The more I'm afraid to die, the more death... and less fun I'll experience).
The Warhawk demo was bad because it has little/no indication that I was hit by a nearby explosion (or direct hit).
EDIT: I like how SIXAXIS is used in Resistance though: Extinguish fire and shake off aliens in close combat. Shaking off Bulleye and Arc Charger tags is useful but usually once you're tagged, you'll be down in mere seconds.