I think they're magnificent birds. They are also one of nature's 'clean up crew' tidying away lots of the cr*p we leave lying around, including squashed beasties at the side of the road.
Ok, Dos:
Do appreciate them, do adopt an orphaned one and teach it to speak (they can do this) do collect some nice photos of them when you are out and about with a camera.
Don'ts:
Don't malign them or be tainted because you watched The Omen once and it's left an almost intangeable but distinct freeling of unease. Don't be bothered by their sh!t - it washes off and it's organic.