I'm not complaining about the difficulty of the artifact quests but I think some players (don't know how many) will be surprised at it.
Here are some of my thoughts:
* LOL when taking a character with action bar half empty because spells gone, into an artifact quest. Fire mage was kind of fun because I was at about 10% HP pretty much forever and somehow scrambling to find the right keys (and finding/dropping spells onto my bar in the process) until finally the "boss" got me. I thought that quest in particular was *exquisitely* tuned because the incoming not easily avoidable damage was very, very closely aligned with what ice barrier can absorb.
* Disc was easy because dude you're healing can't die. Ehhhh might have been hard if he could die, but then if you didn't die, it would be strange, because there would be no one to tell you where to go next. Maybe you would have to resurrect dude.
* This is a much MUCH better way to conduct a basic skills check on a player than PG. I do like PG in a way, but it needs variety and rewards.
* The difficulty will be shocking to some new players. Not really sure how I feel about that. Maybe you can fail your way through the quests with 10-20 resurrects? No idea.
* It's certainly not on the order of difficulty/nuisance of some things in MoP, for example some of the un-nerfed legendary quests/scenarios, and definitely not something you would prefer to use a guide for, like green fire early on with crappy gear.