MNK gets super fun at 54+ with always stuff to do in between GCDs.
It felt boring and slow until 55 because of perceived lag waiting for the stance changes.
With [The Forbidden Chakra] unlocked its very exciting trying to squeeze in [Meditation] to build up Chakra in battle.
Its becoming my fav DPS job after DRG.

SMN at 56+ Tri-Disaster and 58 with Dreadwyrm Trance makes the class a lot more enjoyable with the burst dmg instead of managing dots until then.

Its worth giving them a chance for the jobs to play out if you have the patience for it.