The only thing stopping me from getting this game (aside from not having the money to spend on videogames) is the lack of offline play. I understand wanting to stop piracy...but don't compare a "single-player game with optional co-op" with an MMORPG like World of Warcraft.
That's right. To play Diablo 3, you'll need a constant internet connection -- it cannot be played offline. PC Gamer asked Blizzard why, and the response from senior producer Alex Mayberry was: "Obviously StarCraft 2 did it, World of Warcraft authenticates also. It's kind of the way things are, these days. The world of gaming is not the same as it was when Diablo 2 came out."
http://www.wired.co.uk/news/archive/2011-08/01/diablo-3-oh-noI don't know...I think if I paid $70 for a game, I would want to play that game whenever I feel like it...not just when the dial-up connection isn't taken up by a phone call or, god-forbid, bandwidth caps. I think I'll just stick with console games until they decide to make everything DLC-dependant.