A comment on Tobold's blog about the higher and higher requirements to be able to join a group:
It really is about the risk on the time invested. In the second week of January, or so, it seems the majority caught up with the achievers, and all of a sudden there was a severe drop in the competency and preparedness of the average PuG'er. I started leaving a lot of heroic groups five minutes in when I'd end up doing over 40% of the damage or our "tank" had 18k health. The situation has degraded with PuG raids. I've seen a Naxx10 fail because six of the DPS were doing less than 1500dps.
To me, it's an issue of respect. I invested time and effort into ensuring that I am competent and well-equipped enough not to hinder the success of the run. I expect the same in return from other players. DPS should significantly outperform tanks in their role. Tanks should have at least 5k more health than I do and be able to hold AoE threat. Healers in heroics should have enough spellpower to spare a heal on someone other than the tank, and enough awareness to see when they're needed.
Slackers who seem to think attendance qualifies entitlement show disrespect, and are undeserving of my time and effort.
I am disgusted.
Not at the reaction of this player (sample of a general trend) but of the fact that a massive game encourages and promotes this type of interaction.
It's also counterproductive, as the more requirements rise higher, the harder for new people to reach that level. A social fracture.