Generally I agree, I ride my hybrid over some farely rough ground/tracks/trails and unless the ground is very hard or stoney its no problem, unless coming downa hill at speed, then the suspension gives you more control and I can ride the bike (normally bum of the seat, standing on the peddles like riding a horse) faster down the track.
Though having said that I did a specialist off road course in south wales near port talbot this weekend and you needed every bit of suspion you could get, even the green routes (or baby route as descibed by my mate who does it regulary) had some nasty suprises.
generally on the road the only time I feel suspension would be nice is when you hit hose bone jarring holes in the road. - you may think, why don't you go round them but its often a toss up between going under the tractor or into the pothole.
but I admit I don't always watch the road ahead with the concentration it deserves.
good to know we beat Hungry,Crotia,serbia for road quality - (I'm assuming they have cleared the land mines by now)