Personally I think that the effects of suppression should be randomised to a degree. As a player we should never be able to know precisely how our troops will react. In our games we use the system of Shock to reflect this issue, and indeed unit morale generally. There can be times when units will take no casualties but be significantly suppressed, whereas at other time they can die to a man while still fighting effectively. These are, however, extreme results on the bell curve; the majority of the time you’ll see a general attrition in terms of both numbers and how suppressed the unit is.
Playing the period, not the rules, since 2002