Machines can never be as intelligent as human beings or rather they can never be intelligent. Quora doesn't want to spend money on intelligent human beings to make those decisions, so they have delegated their work to dumb machines. But if this is consistently happening to you, this machine is really dumb to "think" that every short answer must be a poor one.
I like to blog about various topics ranging from education in IITs to social issues in India and US. All opinions and views presented here are my own and not of my employer.