Jias sees it as a bad thing (we have to deal with noobs), but I tend to go a little more toward Neth's side of the argument: it's a chance to be veterans of the game, and to help players who haven't seen all this stuff before figure it out. Just last night, I was leveling my Hunter and decided to join a PUG in Blackrock Depths out of the blue-- for some reason, only one of them had ever been in the instance before. But being an old hand, I led them through all the twists and turns down there, and we finished all the quests through the Attunement rock (The Lyceum gave us a little trouble, but it was late, so we called it).
Will there be a few more players asking for gold or not quite clear that all tanks should be carrying a shield? Probably. But we should probably be as welcoming and patient with these folks as possible-- they'll be the same people listening on the LFG channel when you ask "LFM for Utgarde Keep."