I'll start by saying that, given the skill levels I have seen on the people I get queued with when I try to do my daily dungeon, dread vault needs to be nerfed by around 45,921%. I'm talking about normal dread vault, mind you, not epic. Mobs need to have their AoE taken away, their single target damage nerfed by 6,000%, and their health reduced to instant death from a hard stare levels. The bosses need to not have any attacks, no ability to move, summon no adds, and somewhere between 1 and 7.5 health. And honestly, even of you make these changes, I'm not 100% sure I could push some of these players to a completion.
I wish I had kept more precise numbers, but I never expected it to get THIS bad. Between my GWF and my rogue, I have been in dread vault over fourty five times trying to complete my daily dungeon after hitting lvl 60. But I have only finished dread vault eight times. 8. (and of those 8, the boss only dropped loot 3 times because that bug is still not fixed.)
Now, one may be tempted to say that I'm the reason the dungeons always fail, because MMO nerds always want to try and be snarky, but most of the time I am top damage by varying, and sometimes huge, margins. I don't die to much of anything unless I am the last alive and get overwhelmed. I'm pretty good at getting resses off. I always try and get people to follow the path of least resistance on the last boss (left rear where the tentacles can't hit you), and try to get the people with KBs to toss mobs off the platform on the add phases. I explain as best I can, I do my job as best I can, and I am more patient than a particularly kind stone, because my queue times are over 50 minutes most of the time and I really want to get it done.
But none of that matters, because the average player in this game can't finish a normal dungeon that has no appreciable mechanics other than 'Stand ye not in the crimson upon the floor' and 'Slayeth all minions of the overlord'. It's just too hard for them. And because they can't finish it, that means I can't finish it, after multiple tries, multiple queues, and multiple hours wasted.
Now, the pat answer to complaints like this is usually "join a guild", but in the vast majority of cases, people in guilds are doing their own thing unless there is a real dungeon happening, that, you know, drops actual loot, and they can't be bothered to form an actual premade group for a normal instance with no loot of any worth (and most of the time no loot period). Even in WoW, we rarely ever made a full group to do heroics unless we were going to chain run them because someone needed a bunch of justice to buy a BoA item. 3k AD is not enough of an incentive to make a guild group for pretty much anyone, especially since you can only get it once a day.
What can be done to fix this? Well, the previously mentioned 'nerf into the dirt' method would work pretty well. If nothing can kill the group, then maybe even I could herd these inbred cats to a finish in DV. Another option would be not not nerf it at all, but to raise the AD reward from the daily to something more appropriate. Somewhere in the 7-9 million AD range, to symbolize winning the lottery, which is about how rare it is to finish it as it is now. That would also give incentive to people in guild to make a guild group for it. Another method would be instead of the daily giving massive amounts of AD, make normal DV drop T2 loot, that would get people in there. Whatever you choose, Cryptic, one (or all) of those needs to be done.
Now, for the queue system itself, I have to start off with a question: Why is there no way to refill empty slots when the inevitable "dis to hrd, im out bb" person bails on the group? Or when a genuine DC happens?
Why are non English speakers put in groups with English speakers? Yes, the need for complex tactics is pretty light in this game, but when someone is new to the dungeon you need to be able to explain things to them, and a lot of the time now, you simply can't.
Why do you have to leave the instance to be able to teleport to the group if you DC and can reconnect quickly? Why does it not simply put you where the group is automatically?
The queue system needs some work, and as fast as you can do it as well.
That's most of the main points on this general issue. Things need to change so that trying to do the daily dungeon is either fast and easy, or very rewarding experience, and not the current mind searingly frustrating experience that it is, where I want to lay down on the floor and just cry until I die crying because yet another group can't figure out the Mongolian calculus equation that is normal DV.