Your analogy is garbage...if we up the damage of mnk and war by an extra 100% of what it does now, and nin by another 80%, you still end up with your layout of 2,1,pack,2. The difference is relevant however, so I don't see how your massive generalization means anything. Drk was already one of the worst DDs at 75, and War one of the best. Now, War got a huge buff and Drk stayed exactly where it was. I don't see how you can't say that the gap widened, and it's more unbalanced. Is it a huge deal? No, probably not. Is it more unbalanced than the past? For sure. Did RR magically fix the game and make it more balanced? Not at all.
I do agree with you that trashiest melee is never worth having in the ally...the point is that's a blurry line, and in the end, only the top 1-2 are truly worth having in the ally (though in practice, I don't actually care what people come on - but this isn't a new to Abyssea thing, it's always been that way unless something was very under-manned.). I won't sit here and argue their jobs are worth having and we aren't hurting ourselves by taking them though...