You have to drop the thinking of any job being far behind. While people do act and speak like there is a huge gap between some jobs, there really isn't that many cases of jobs being significantly behind.
There have been some cases in the past, like DRG falling behind when NIN came to the game, and SMN having massive mana issues in 2.4... but otherwise, what you've seen since 3.0, have been because of 3 new jobs, which will always create problems. Those problems have been fixed some time back, and now there is no job that is useless or anything.
I don't know who have told you BRD is broken... because the best raid group there is, used one, and trust me, they test every job there is. You have to have a BRD or a MCH in your group, and BRD is more desired than MCH most of the time(not because they're better), so your statement couldn't be more wrong.
NIN is another job that was picked for the best group out there, and 2.36% increase in DPS that MNK got, didn't really change that much. If you have problems with lag, then NIN can be annoying, and it can affect your DPS some, but that's not NIN being bad, that's a problem with connection.
PLD is the only one of those 3 that there are some grounds of discussion, and I would say PLD is behind DRK and WAR, but that's more down to how Alex Savage have been designed, and we're not talking about any huge differences either.
All in all, you can pick any job in the game and still bring something to your group