The only jobs I worried about at the beginning were White/Black Mage, and I had Bartz as a Knight, but as you progress the jobs get a lot better.

Here are my characters jobs, and I am running through the game like it's nothing! (If I can get myself to play)

Lenna= White Mage/ Summoner/ Ninja
Bartz= Knight/ Thief/ Mystic Knight/ Dragoon
Faris= Blue Mage/ Samurai
Galuf= Black Mage/ Time Mage/ Chemist