Say what you want, but these guys seem to know their stuff. As always, the error (if it exists) in this system is human in that the accounts weren't shut down immediately, but lets be honest, the bitcoin community is so full of speculation and rumour and you can't be awake 24/7. I don't use MyBitcoin but it sounds like they've done their jobs here.
I'm sure they've been doing a fine job of keeping bad people out. I say this because, from first experience, they are doing a fantastic job of keeping legitimate users out.
Still Waiting, Tom.