You're free to call bullshit on whatever you want, that won't remove the fact that ramping up dungeon difficulty once the LFD was introducted was idiotic and led to the biggest loss of subs of all wow history. Especially after the level of heroics in Wotlk.
Good for you (and neither did I), but a lot of people simply chain wiped in a lot of heroics, especially stuff like Deadmines. You can't expect random people to plow through Cata-level heroics, especially with remarks like "stop doing content if it's too hard for you". And they massively showed their displeasure. Blizzard reacted but the harm was done.
You freaking can't expect a random LFD group to "put in the damn effort". BC heroics required that, but they required a manually picked group.
That's what Challenge Modes and heroic raids are there for. Not level 90 5-mans.
---------- Post added 2013-02-15 at 09:42 PM ----------
Indeed, the QQ was memorable. I guess those people went back playing Lineage or whatever extra-hardcore stuff they did before wow.