I wouldn't call it the WORST FF ever, tho Yuna's Hotpants Adventure (as it has....affectionatly...been called on other forums) won't be winning the award for best FF anytime soon. It really had a lot of good things about it like....ermm, gimme a minute...well, I did like the battle system, the graphics were great, and I loved the perfect ending.

Unfortunatly its bad story, HORRIFIC music and overall lack of origianlity make it a pretty face in the crowd and nothing more.
I'd say play it if you've played X, then sell the damn thing while it's still worth something. It may be an FF, but by no means did it measure up.