Easily fixed with integrating the down vote system. this way minnows, dolphins and whales can have their say without flagging. Down voting could/can/will eliminate shitty posts being rewarded.
This will be an incentive as well, for a massive amount of people to go through garbage and down vote it, for it would be a part of the curation award system much like up voting. So within the 7 day period, the angry mob will hunt for bad content, get rewarded for down voting it if it's bad.
Bad moods and maliciousness will be equaled out as up voting is too an incentive for reward on curation activity for steem. Furthermore, up voting posts should give the author more steem, as well.