The Daily Grind: Which MMO has the best PUGs?

PUGs (that's Pick-Up-Groups, for those of you keeping score at home) are those groups that get thrown together around getting a mission or a quest completed, tackling a boss or snagging a rare drop, where you just can't handle things on your own, and your regular posse (if you have one) isn't around.

Around the Massively office (composed largely of tubes, gnarley space-time, tofu and Cheetos), we've been swapping some of our own PUG stories, and it seems clear that some MMOs seem to have much better PUG experiences than others. Some seem to always be golden, others about half and half, and others are full of ninja-looting, healers tanking, and team members suspiciously going connection-dead at the first sign of a stiff fight. Over to you, dear readers. Which MMOs have consistently given you the best PUG experiences?