Cait Sith also had a "Game Over" move on his slots.

And, yeah, I think anything that does an unstoppable insta-kill on your party (or even one member of your party) is ridiculous.

I haven't been able to get that far in the game though, I'm stuck in the battle where Locke is fighting alongside the moogle army, and I'm having a lot of trouble taking down all those enemies.