Difficulty has been a constant source of division when discussing the game. Some players believe Diablo has never been about crushing challenges, but more about efficiency and farming. Some players want a game that tests them to their limits. Neither player is wrong. As it stands, Diablo III simply does not provide the tools to allow players to scale the game challenge to something appropriate for them. We set Inferno as the high watermark and took a one-size-fits-all approach to game challenge. Later in the development of Diablo II, the 'players 8' command -- which let people set monster difficulty -- was added to address this issue, and we're considering something similar for the next major Diablo III patch to allow players to make up their own minds about how hard or how easy is right for them.
The Auction House has also proven to be a big challenge. It adds a lot of power for players to trade and acquire items. Getting a great Monk drop that you can trade for better gear for your Wizard is obviously a great benefit, but it does come with a downside. The Auction House can short circuit the natural pace of item drops, making the game feel less rewarding for some pla