I think FFV is the most underrated SNES FF game, and it definitely gets the least amount of attention out of FFIV, FFV and FFVI. While FFIV and FFVI focus on a pretty dark storyline, FFV's story is more lighthearted (although it has a lot of very tragic moments). I still enjoyed FFV's story and thought it had a lot of depth when I played the game for the second time.

However, FFV's main attraction, IMHO, is the Job/Ability system. While FFIV and FFVI had huge storylines, I think their battle systems pretty much pale in comparison with FFV's. The Job/Ability system is fun and addictive, and it lets you customize your characters well, into what you want, but still everyone remains different from one another, so you can't make all-powerful tanks who are carbon copies of each other (like in FFVII, FFVIII and FFX).

While I don't think FFV is the best FF, it has a really great gameplay, and it still has an enjoyable storyline and a great soundtrack in addition to that. The GBA version enhances the user interface and makes the battles even smoother and more enjoyable. In addition, it seems the script has been enhanced a lot, providing some humor and flesh to the characters.