The professor for whom I'm TA'ing gives his students a chance to rewrite one of their papers at the end of the course to improve their grades. Those papers that are re-submitted are graded by the TA who graded the first draft.
I have a sinking feeling that I'm going to get slammed with a pile of revisions, compared with the other TAs. Why? First, I think I graded marginally harder than they did. I'm not doing that again this batch of papers, for sure, but it's too late to go back and give everyone half-letter upgrades on papers that I thought I was grading extremely generously to begin with.
Second, I give very extensive comments; one of the other TAs does as well, but one just scribbles a few notes at the bottom of the page and leaves it at that. I'm guessing that students will be more inclined to revise the papers on which they've been given clear indications as to how to improve.
Fortunately, I won't have to share grading responsibilities again after this semester. But the take-home lesson isn't good: give students high grades and few comments, and they won't bother you!