Any melee that does not know how to keep up high uptime on a boss, unless the mechanics physically makes the boss disappear from the arena, is a bad melee. Seriously.
The only class that horribly affected now by mechanics are BLMs. SMNs to a smaller degree.

There are so so so many things you can do as a melee to keep uptime on the boss. If people are not capable of doing it, then it's not the problem of the archetype. It's the player.