This is something that has been experimented with before.
Due to the opinionated nature of films, it is hard to be objective in analysis of why a movie flopped at the box office or is considered the worst of its time.
When asking a question like this, you have to ask yourself if it can be answered objectively and also state what you are looking for in an objective manner.
For instance, if no one liked Adventure Time because they just don't like it, that is all subjective and not a fit for this site.
But, if the same question was but was phrased in a way asking for objective views of why it was not a successful show, then you would get figured like ratings, cost per episode vs return from advertisement, etc.
Essentially, if a question like this is asked, make it clear the answers must contain objective views as subjective gets closed as Not Constructive due to the discussion occurring.
Ask for objective figures, average rating, sales figures for both theatre and dvd/digital, neilson ratings for tv shows, etc.