Let's compare final Limit Breaks, shall we?

While Cait Sith has a variety of Limit Breaks, some being useful, and one actually being able to kill you, the other characters' have more useful Limit Breaks.

Cloud being able to hit the enemy/enemies at least 16 times, Tifa being able to hit 7 times, Aeris being able to cure the party of all negative status effects, restore all HP and MP, AND making them invincible for a period of time, and Cid being able to hit the enemy/enemies multiple times. I would choose Omnislash over praying for an instant victory any day. That's why most people hate Cait Sith.