No one is a 10, and if you say that in an interview, it comes off arrogant. Always state at least one less, like a 8 or 9 and simply state that you are always learning and there are many trips on which you learn something new. Remember, nobody is perfect. That kinda response is much better. It shows a humble pilot, who is also willing to learn and improve. If I was a hiring pilot manager, I'd be turned off by anyone claiming to be a 10. I would picture someone trying to be Chuck Yeager, and put negative marks for that question.