Corporate is a deliberate non-meritocracy whose purpose is to ratify the inadequate descendants of an existing oligarchy as meritocrats. Mussolini didn't make the trains run on time; he punished people who said the trains were late. Corporate is the same: meritocracy by assertion--and only by assertion.
In school, you learn that hard work is rewarded (with some noise) and that cheaters eventually get caught. The system isn't perfect, and there's definitely some corruption in admissions decisions later on, due to the socioeconomic fuckery that infects everything... but the attempt to be a meritocracy is at least clearly there. If you are treated unjustly by the system, you can at least appeal to the concept of meritocracy, and you have a chance of winning.
Corporate is easier, in the sense that the work is almost never demanding, and the evaluation thereof is invariably political... but if you go in expecting a meritocracy, because that's what 16-20+ years of schooling had you believing you would find... then oh boy are you going to be disappointed when you see what it's actually like. If a professor played favorites the way the average corporate manager does, he'd be fired.
Corporate is also a lot noisier. In school, you might get a B when you should have gotten an A, once in a while, but over time the noise cancels out. In corporate, you can get fired, and have your income turned off, for all kinds of stupid political reasons.