I have not or have tried the flagging options. I would say that term flag should be changed to downvote instead. It's a free market, anyone can do anything with their stake :) let the free market plays beautifully and we've seen it happening.
I know sometimes there are quote posts that don't make any effort at all. For some people they like it but I don't. The thing that I am strongly against is the plagiarist. Steemit has no plagiarism checker and it's getting difficult for a curator to check the originality of a post.