World of Warcraft Developer Blog Update

Blizzard has been listening to the feedback on the latest expansion to its MMORPG World of Warcraft, Cataclysm, key amongst which is "it's way too hard". Lead systems designer Greg Street provides comments to the criticism and tips on how to improve.
The bottom line is that we want Heroics and raids to be challenging, and that is particularly true now while the content is new and characters are still collecting gear. They're only going to get easier from here on out. We want players to approach an encounter, especially a Heroic encounter, as a puzzle to be solved. We want groups to communicate and strategize. And by extension, we want you to celebrate when you win instead of it being a foregone conclusion.

On the other hand, we don't want you to stumble your way to victory. We don't want you to be able to overwhelm bosses without noticing or caring what they're doing. We don't want healers to be able to make up for all of the mistakes on the part of the other players. While at the end of the day, dungeons may just be gussied up loot vending machines, we want you to do more than push a button to get the loot.

Ultimately, we don't want to give undergeared or unorganized groups a near guaranteed chance of success, because then the content will feel absolutely trivial for players in appropriate gear who communicate, cooperate, and strategize.

We didn't like that the Heroic dungeons in Lich King and early Naxxramas had become zerg-fests. It made the rewards feel like they weren't earned. It made all rewards except the best-in-slot items feel transitory -- why enchant or gem an item when you don't need the performance boost and you'll quickly replace it anyway? Furthermore, it set the expectation that everyone would eventually earn all best-in-slot items rather than those being rare and treasured goals. It made class abilities feel less useful and interesting. Who needs that crowd-control or survivability talent when nothing is hurting you? Who needs a mana-conservation talent if you're never going to run out of mana? Who needs a crit talent if your heals often overheal anyway?