Coming from someone who has brd and dnc at 75 as well as a few other jobs, I actually see more endgame time on my dnc than I do on my brd. We have a few other brds and once you get to a certain point so many brds are just a waste of space.
As was mentioned dnc however can lower mob magic def/eva. Also, other things that are conveniently not mentioned are the facts that dnc has a pretty close to broken gravity. I've seen, and had, dnc's gravity stick on some NMs even when rdm's have trouble. Not to mention dnc has stun on a 20 second timer, when combined with the lowered mob mag def, and relic body if you're that lucky, is fairly reliable. Use it on anything you think you can stun, at least that's what I do in those situations. For anything that needs to be stunned no questions asked there's almost always a rdm/drk there for that, but your stuns are dandy for other things. Plus the added benefit of being able to toss instant cures on a tank as needed.
Dnc's perfectly fine for endgame, the problem is finding a niche, as well as a shell that will get over the whole "Dnc's useless for Endgame thing". Even if it's just to go dnc/sam so you can build tp away from the mob to toss cures on a tank, or to open skill chains for sams etc.
Also, if you're wanting to do endgame stuff, I suggest getting w/e mag acc gear you can as it increases the proc of your stun, as well as gravity.
