What makes a good Instructor?

[Jitsu ()]

What makes a good instructor - in your eyes?
One who has had lots of fights?
One who has lots of trophies?
One who as never been in a fight?
One who is willing to teach you everything they know?
One who will only teach you what they want?
One who will only teach you for competition?

Out of the list what one is the best instructor?

Anyone got any other views on this ?

We look forward to your opinions as well.