As a Japanese RPG, Final Fantasy IV falls prey to a lot of the same pros and cons of other games in the genre. The pros? Well, it's certainly long and it's got a whole bunch of little extra features in there to give it more depth and replayability – form the New Game+ option through the expanded bestiary.
The cons meanwhile are that the storyline is convoluted, dense and intimidating. There's a lot of characters talking about their feelings and their ethics all the other things that the floppy-fringed sword-swingers care about. The story also feels like it's needlessly padded out at points, which somewhat undermines the really nice touches like being able to see the thoughts of the characters as you play the game.