Only if they are truly low quality or if they are inflammatory towards a group of people things of this nature. A lot of people flag down things that are well written that they simply disagree with and I do not believe that is fair at all, particularly if it is written well.
I will flag down for multiple grammar errors and spelling issues - not just the periodic "oopsie" but stuff that's difficult to read that you can tell was not proofread in the least. That or hateful speech etc. Otherwise I just pass it over.
Stuff that is obviously Spam or spun content I flag.