[Zimahl]

You are correct, this is less than a big deal. In fact it's pretty irrelevant.

Third parties hacking battle.net accounts aren't doing so through brute force, they are doing it through phishing and viruses with keyloggers.

[lawnchair_larry]

This is kind of important. I will reserve "big deal" for other infractions, but it's far from harmless. It's important to protect your users passwords regardless of whether phishing them directly is the more popular attack. If you don't know why, just ask Sony and Valve.