What do you look out for when main-ing a character/class/job?

actually when i mained my phantom and mercedes the things i looked at are:
1.actual gameplay and abilities-i didnt looked at the attacks % damage and what the buffs brings,i just looked how the class actually play and in both phantom and mercedes its interested me(the combo system mercedes got raising rush+SM kick+leap tornado+gust dive make it a fun class to play.and for phantoms the steal skills ability and the attacks of mille and tempest)
2.plot-it may sound childish or something,but the class story actually interested me.phantom's story own them all. and mercedes all part of being the ruler o the elves trying to unfreeze them from the curse...its basically what the job represents,phantom's changing the way of life for good(although i think phantom was never mean at all) and mercedes's saving its own people...even xenon trying to remember its past and overcome its mechanical parts
thats actually it.i never really cared about damage at first place (note how weak phantoms are at the moment)the high crit rate and avoid of both jobs are a bonus but nothing else.
you should choose a class based on your gameplay style.thats why i get bored often when i train link mules (im looking at you DA)