The new dungeon system is pretty awesome. You queue up get ported right in, no more waiting a few minutes for the first two to fly from Dalaran to some dungeon in the middle of nowhere to summon. Should things go south or you forgot something you can port in and out of the instance to repair/resupply all by yourself on a whim.
I really wish I had figured that out before I ran out of Pit of Sauron, found myself back in Dalaran and then flew back. I knew I read about the easy in/out feature, but I didn't know how it worked and no one else did either. Didn't help that I had an add-on covering the button on the minimap.
As expected it is hard to find a tank and to a lesser extent a healer if you queue up with 3-4 people without one of those. My guess is like me tanks and healers queue with a friend or two and are just looking for one or two more. There are stag tanks and healers out there, you just might have to wait a while.
I know there are more tanks and healers in the queue, but like me I bet a lot of them uncheck those options to just go in and DPS. It's fun to have a change of pace after a tanking or healing for a while.
The quality of PUGs seems to be OK from what I have seen so far. For the most part the largest problem I see is knucklehead DPS that can't watch threat worth a damn. I keep telling healers to let them die if they make a habit of tanking. The second issue is people without a clue, especially in Oculus. Three of us got it as the random heroic and basically 3 manned it despite making an effort to explain the dragon mechanics.
Although the new system is faster, you can't "interview" your fill-ins ahead of time. In the old system I judged characters by their names as well as their responses when I asked if they would like to run any particular instance. You can weed out a lot of stupid that way.
I was never one to look at gear, but the new system does that for me supposedly. Seems to work in that I seem to get grouped with similarly geared people. That offsets the stupid filter a little, but still there are those decently geared folks that just don't have a clue.
The worst part of the new system is that it takes away from guild runs. People will run in groups of two and three with PUGs rather than take the time to organize 5 guildies, myself included. It isn't all bad since we run more and get to meet new people. Even if we don't like the new people it gives us something to talk about in the guild vent.
I had originally foreseen that the random heroic being repeatable would mean that when you asked in guild chat if anyone would want to run it that no one would be saved. The reality though is that they say they are in one right now and could do it after. So you end up PUGing and thus completes the vicious cycle.
Looking forward to trying the system out on some lower level alts in the next few days. Those groups have been historically really hard to get together.