Great subjective questions inspire answers that explain “why” and “how”... check
Great subjective questions tend to have long, not short, answers... check
Great subjective questions have a constructive, fair, and impartial tone... miss, especially in the title
Great subjective questions invite sharing experiences over opinions... check
Great subjective questions insist that opinion be backed up with facts and references... miss, although I do bring up numbers and experience in my comments; I just didn't put the stock paragraph in the question body asking for people to back up their claims.