Apart of introducing the job system, everything else is terrible in this game. By far the worse of the numbered series.
Story is generic almost like a remake from the past two games, very unfair last dungeon (even in the remake they didn't fix this issue). The dungeons are annoying, particularly more when you need to become tiny. That's a feature that fortunately they quitted from the following titles. Also this constant crash of the airship is the most irritating of all. If this version is supposed to be better than original, I would stay very far from the NES version.