just to add, this can be simplified to a grossly over-simplified physics equation... F=MA
assuming constant acceleration down the fall line:
the more mass, the more force it takes for snow to deflect the ski, and the more force it takes a skier to manipulate the ski.
the lower the mass the less force it takes for snow to turn the ski, and the less force it takes for the skier to manipulate the ski.
metal is so widely appreciated since the material is adding weight to the ski, but also adding rebound and torsional rigidity compared to fiberglass or wood. Rebound makes the ski more responsive and physically less demanding than an equivalent weight material that has lower modulus, or another way of saying it is that very good metal skis "ski light" since that have snap and life. Torsional rigidity makes the ski track cleaner and rounder without deflecting, which means, depending on the goals of design, the ski can be made lighter, or be left with its weight.
a simply heavy ski (say straight glass with a dense wood core), in and of itself, is nice, but often can feel dead and unresponsive compared to a similar weight ski with more rebound and torsion (wood core + metal laminate)
of course different skiers on different terrain with different snow means some are going to love what others hate...
and to circle back to davluri's original point, i think SOUND of a ski actually makes a HUGE difference about the PERCIEVED dampness or smoothness of a ski, and the less resonance the ski has, the less you hear it on firm snow, and the more smooth you perceive the ski to be.