Can't speak to BRD/MCH but I would say DRG is hard to optimize and mainly for the sheer fact I forget to use Mirage Dive after Jump/Spineshatter. MNK is good and I enjoy the flow but the expansion abilities feel bolted on in comparison to the other melee classes. I feel MNK suffers the most depending on the boss. Lakshmi was the hardest boss for me to keep my GL3 stacks and getting them back takes a long time in comparison to the refresh rate of any of the other melee classes.