The linearity of it (The game is described by a lot of people as a "Hallway") seems to be why a lot of people don't like it. But when asked, most people prefer it over uhh, lightning returns was it? it's one of the 13 side games.
Final Fantasy has always been kinda linear so I don't really care about that personally. Imo the story akd most of the characters aren't that great. Lightning is basically Cloud, Hope is an annoying piece of shit. Only characters I cared about were Sazh and Vanille. I do love the music 100% though.