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Personally I don't think anyone has one. We all knew Diablo 3 was going to be online, we all know there are bugs in ANY game and they don't always surface until its to late.
When you purchased the game you good and well knew what you were buying. There was no secret, the game was for everyone to see. We even had a sneak peak at how a stressed server would handle. We all know extremely popular online games suffer instability every single time.
Seriously though, you honestly think you can moan? This isn't likely most of your guys first rodeo.