But to say that work is not demanding and evaluation always political is very big generalization. Some hard projects go to people that can handle them ( or can't if you don't like them ). When that big project is over, there seems to be a very clear indication, who MVPs are ( even if they do not have 'in-group' status ). So some level of meritocracy exists. It is hardly perfect, but it is there.
On the other hand, school-wise I had a very wide range experiences, which kinda taught me that 'people tend to believe what they want to believe', by which I mean that teachers that think you are a good student will let you be a good student.
I am writing this as I am sipping coffee preparing mentally for this year's projects.