How good of an admin are you?
Instead of staying on topic, almost everyone jumps into the ridiculous argument of UNIX vs Windows.
Really guys? If you're distracted by such idiocy, just how good can you be at administrating an operating system? I would hope you'd be more professional and not let some post agitate you.
You'd serve yourself better by taking these articles and using them as "lessons learned" to ensure your systems are secure. Just because you believe your systems are securely configured doesn't make it so.