I have noticed that many questions tagged with identify-this-movie identify-this-tv-show do not have very many votes, and regularly have negative votes.

Is there a specific reason why these questions are downvoted so frequently? There are some questions which do not simply have enough information, but there are also several which have enough detail to be answered, but they are still downvoted anyway.

One example I found was: http://movies.stackexchange.com/q/49519/30467. I was able to answer the question with about 90% confidence that I have the correct answer. When I answered it, it had a -2 score.