There were a number of server slowdowns and issues for gamers looking to play the game on opening day and, as a result, Blizzard was very apologetic in its statement:
"We’re definitely thrilled that so many people around the world were excited to pick up their copy of Diablo III and jump in the moment it went live," said Mike Morhaime, CEO and cofounder of Blizzard Entertainment. "We also regret that our preparations were not enough to ensure everyone had a seamless experience when they did so. I want to reaffirm our commitment to make sure the millions of Diablo III players out there have a great experience with the game moving forward, and I also want to thank them for their ongoing support."To cut down on cheating and piracy, Blizzard requires the Diablo III client to be connected to their servers at all times during gameplay, even during the single-player campaign.
Diablo III is available via Blizzard's website and at retail stores.