It highly depends on the content...
In dungeons, monks are really bad (no sustained AOE damage, GL always down) while BLM are kings.
In SCOB, it is not possible to outdps a good melee, unless the gear difference is huge. Turn 8 is probably the best fight for Monks and Dragoons. BLM can now be on par with all the other classes (Brd, Smn) on a single target, which is definitely a good thing.

You cant expect to be king in AOE/old content AND king in new/hard content.