I dont really agree with the list myself
Tellah, Umaro and Rinoa I personally dont like
But Cait Sith is good for magic and stuff and was in my final game-party a few times
Quina ??????? She/he is like the best in FFIX, White Wind and Frog Drop is all you need
Wakka has high stats and later in the game can do some of the most damage
And people dont like Rikku cause they dont give her a chance due to getting her late in the game and starting out with low low stats
But thief skills have always been the best skills out of any game bar-none
