[unsupak]

It depends on whether there are any checks so that such ranking systems are not abused. I know first hand that such systems are ripe for abuse by those who are connected. I know of an incident when a well connected long term employee performed very poorly and was put in the weeding out category. However because of his connections with Vice Presidents was able to engineer so that someone else was given his place in the ranking and fired. In a way a person was specifically hired to that team, reviews were engineered to give him a bad review in order to remove the well-connected but badly performing manager from the bottom list. This was not uncommon and would happen invariably in order to save the well connected but poorly performing person.