For solo fights like KS30, and KCNM fights, /sch can shine. if you are going to serg, Metelic body or stoneskin + sublimgation equal a good chunk of convert without sacerficeing any HP.
And the cure + dispel is very nice. Not to mention, with /Sch, I can AoE stoneskin, paralina, and such. Whatever I do I perfer the 400+ magic rateing plus gear skill ups over something below 200 skill. Access o some /rdm spells is usless if the skill is so low.
The nice thing about blu is you can totaly custimize it to your play style. Hence no right or wrong way to play it. So few jobs offer this chance. Blu, Sch, Pup are really the only three.