Most of this stuff is all about how the class actually plays, rather than what I was talking about, which is how it's overall role should be perceived. If people are trying to compare them solely to dps then I would argue it is on them regardless of how the class is setup, as how a class plays doesn't really have any baring on why you actually bring it to the group. The MCN/BRD "usefulness" that Sorian talked about is their battery powers, and I don't get why that is looked down upon compared to DPS considering how important that is. The fact that it has DPS cooldowns/mechanics doesn't change anything - it's exactly as you say, it's balanced around the fact it brings support.There's a difference though because it's not done in a way that makes it interesting, and most of the focus of the class is actually on doing DPS. See healers have a lot of heals, most of their focus is on healing(they have a few damage spells too, but they're very boring and the DPS rotation of a healer is generally do all dots > spam nuke, no proc, no cooldowns, no combos, it's a minor aspect).
On the other hand, BRD/MCH is basically entirely about the DPS aspect, with a couple of buttons you can press once when you need to refill bars for people, and then it happens over a period of time. If the bard combos had buffs/debuffs linked to them, if they literally had songs combos or whatever and if they were a full blown support with a few damage skills thrown in, people wouldn't really compare them to DPS, but it isn't really the case. They're DPS classes that happen to have vital support abilities slapped on them. But because these abilities are so strong, the entire class is nerfed down to balance it out.
If you don't like the healer example you could just as easily look at tanks, as they more or less play like sturdier DPS, but against equally skilled/geared DPS they will generally fall short. Which is fine, because their main reason for being in the group is outside DPS, just like BRD/MCN.
I do think BRD/MCN need some adjustments, they definitely should not be out dpsed by tanks, but being lower than everyone else is fine considering what else they bring to the table. That is part of why the whole BRD stuff is so baffling, they really had them perfect at the end of the 2.xx cycle. They were lowest dps, but not too far and still beat tanks. In return they got freedom of movement and excellent utility. It was all really well balanced.
Adjusts to the exact numbers need to be made but the overall intention is what I was talking about, and am generally ok with.It's more the amount they give up for the battery effect feels a bit imbalanced. I don't think their regen effects are really strong enough to warrant this whole ~20% worse than the other DPS and THEN lose 15% more to even activate it.