Vantaggi
If you are a hard worker and limit complaints you will do fine. Negativity is bred. If you maintain a positive outlook and don't listen the complainers then you will be successful. Management looks for people with positive attitudes and even though there is a perception that people that brown nose succeed I have not witnessed that. Most of the people (I say most because there are always favorites) that have been moved up the rankings over the past year or so seem to deserve it. The employees under them haven't complained much and seem receptive to have a fresher, new crop of supervisors. You always have stragglers who moan and groan over people being promoted. These are typically the people who are stuck in there ways, afraid to change and do the bare minimum.
Svantaggi
Sometimes focus is on the negative. As new supervisors come in I think this is getting better. Supervisors are urged to focus on the positive, however, they are slow to change if they've been around a while.