Currently dungeons are a joke, whether Wrath normals or Cata heroics - it's a matter of pulling groups and blasting them to bits, you occasionally have to move a few yards out of the fire, not that it kills you half the time.
Cata release was hard, I agree - and however much I liked the exclusivity it wasn't good for everyone. I remember clearing SFK Heroic and being damn happy with the 346 blue weapon, it was good and earned well.
Why cannot we have a compromise?
Dungeons, Heroic Dungeons and Raids should NOT allow AFKing or total ignorance, you don't have to be a fantastic player to move from fire and use polymorph.
These are my suggestions:
1: Bosses have larger health pools, or at least the health pools must be buffed as patches/expansion progress. Talents, moves, gear and nerfs mean we can steamroll through dungeon bosses in under a minute, ignoring all tactics - this is not a good thing.
2: Consequentiality is required - misspulls, lack of CC (every class has it now) and general idiocy should result in wipes.
3: Aggro - I tank on 4 characters, on none of them do I need to pay attention to aggro, whether single-target or groups. I can Swipe, or Pestilence, or Thunder Clap, as for my Paladin I barely do anything. Why not dumb down tank aggro so both parties have to pay attention when they play the game.
4: It's obvious just talking with guild mates and people I'm partied with that the general consensus is that there should be a bit of a challenge in any PvE content, if Mists of Pandaria isn't any harder then any PvE under Heroic level dungeons will hold no sense of achievement.
I swear the nerfs are to make it more friendly to those not raiding the harder stuff, but making it this easy just means if you're not the top tier of PvE, then content isn't fun.
We can see it in LFR, I join a group as dps, I pull 13k and we down the first 4 Dragon Soul bosses in about 40 minutes, no wipes - this is ridiculous.
Feedback please, rant over.