My warrior is now wearing 10 epic pieces, due to participating in a guild run to the Vault of Archavon in which 2 warrior epics dropped and I happened to be the only warrior in the raid. But I still haven't seen the inside of Naxxramas with that warrior, as for the "official" guild raids I'm needed on my priest. So when I heard somebody advertising a Naxxramas PuG in trade chat, I was interested. I just didn't quite understand the "link your achievement" part of the advertisement. So I checked what achievement he wanted to have linked, and it was "The Fall of Naxxramas" of course. You were only allowed in the Naxxramas group if you had already completed it. Doh!
There is a general trend I've noticed in which requirements for PuGs are getting more and more ridiculous. You can get kicked out of a PuG for a simple heroic because you don't have 2,000 spellpower. Which of course is difficult to get to if you can't get into a group to do heroics in the first place. Basically what these people are advertising is that *they* want a free ride to some place, inviting only overgeared people. And then of course there will not be any crowd control, no sheeps, no shackles, no saps, no ice traps. Everything will be AoE'd instead. Minimum skill and time requirement, but only completely geared up people are welcome. Once I even saw somebody requiring the "Northrend Dungeon Hero" achievement for an heroic invite.
With the automated looking for group system still not good enough for anyone to use it, and the few people organizing pickup groups only taking overpowered people, I guess I'll stick to going to dungeons only with my guild. Otherwise I have to wait for the next expansion where Blizzard borrows the idea of public quests from Mythic before I can find a working pickup group. :)