Most underrated Final Fantasy game?

[Kaunisto]

I've played 1-9 and of those I'll say FF5.
I do get why: 4 & 6-9 are all story heavy and FF5 is kind of forgettable (especially if you've played 3) and that's why I wouldn't name it among my favorites. But in gameplay it may be best of all.
Also the first two excel in some things.