I think most of the 15 min actions are good but i think BLM, MNK, PLD are lacking, not sure how well BRD, WAR, and DRG are but they might suffer from this same problem also.

BLM: While Burst looks cool i think the skill does not do enough dmg even when i have had like 200 hp it's like slightly better than Thundaga when your hp is that low. The dev teams needs to increase the base dmg, I feel it should do 2k dmg when full hp and only get strong as hp lowers.

MNK: The skill it's self is great but... only lasting 10-15 seconds is terrible, Spinning Heel is almost as good as Hundred Fist for gaining tp and dmg, The dev team needs to make this skill feel worth the use over Spinning Heel.

PLD: This one is good but 10 secs long is pretty lame that's all i have to say about this one.