I didn't grade anything myself, but I have experience of watchinig somebody do it for many a year.
Gr....
And not there are plagiary committees. That is a joy that is hard to describe. And the amount of time it all takes. And when do people do their research, at night? I know now when, during their vocation times and no Saturdays or Sundays.
Somepeople take this better than others, but academic life did not turn out the way I thought.
However, there are pluses as well. Going to conferences, meeting interesting people, doing your own research or teaching is interesting and sometimes exciting.
I think there are kind of rules of civilized beheviour, namely, one should not say badly about some other teacher's work in front of a student. We have people just moved to the area who (I suppose in their despairation to get students) tell bad things about other teachers and this way lure students away.
The incident I go through at the moment is a first experience of a kind in my 30 years of teaching. I am still in contact with students that I thought when I was in my twenties.
But everythings passes and this will pass too. So I am just waiting for it to pass.