If you're pissed off because some silly forum* got hacked, wait until you get bank accounts, real responsibilities, and are the victim of real hacks like the Sony and Steam one. A forum got hacked? Password change. Someone got your CC info through no fault of your own? That's a real reason to be pissed off.
As for me, I'll just shrug the hacker off, change my password, and move on. There's a lot more important things in life than the security of your GMC account details.
* Note: I like the GMC and GM a lot, but in the end a lot of people end up taking it way too seriously.