The authentication system used to log into D3 is the same one that's been used for WoW and SC2 for the past 5+ years, so people are getting hacked for the same reasons, and by the same methods, that they've been being hacked all that time. Blizzard can't save everyone from themselves.
I believe that there's just a bunch of new to B.net people that bought D3, didn't have authenticators, and weren't as careful as they thought they were, and the hackers had a field day. Of course, I would figure the hackers can read calendars, too, so they've been gathering data for a while, then hit a bunch all at once, too.
My anecdotal data in support of this is that generally the WoW and ex-WoW players who bought D3 have not been having any hacking issues, because they're already either very careful, or have authenticators, or both. You can give that as much or as little weight as you want.
Or, you can believe all the people on the official forums who are looking for someone to blame, of course, if you have an axe to grind with Blizzard.
I believe that there's just a bunch of new to B.net people that bought D3, didn't have authenticators, and weren't as careful as they thought they were, and the hackers had a field day. Of course, I would figure the hackers can read calendars, too, so they've been gathering data for a while, then hit a bunch all at once, too.
My anecdotal data in support of this is that generally the WoW and ex-WoW players who bought D3 have not been having any hacking issues, because they're already either very careful, or have authenticators, or both. You can give that as much or as little weight as you want.
Or, you can believe all the people on the official forums who are looking for someone to blame, of course, if you have an axe to grind with Blizzard.
--Mav