The problem that a majority of people have with it is the terrible characterization of 4/5th's of the antagonist and the horrible pacing. The game play isn't great either, but the same can be said of some of the stupid court mini games of the main series.
How do you know the majority of people has this opinion?
http://www.metacritic.com/game/playstation-vita/danganronpa-another-episode-ultra-despair-girls
http://www.gamefaqs.com/vita/730569-danganronpa-another-episode-ultra-despair-girls
Average user scores on these two sites are 8.6 and 8.2 respectively. Doesn't sound like the majority has too big of a problem with the game.