For the good: I find them to be very entertaining to watch outside. I like how intelligent they are, and I like all the neat things they can do. It is rather intriguing.
For the bad: I guess they can be annoying if they take things that we wanted for ourselves.
Here's a cool documentary about crows from online; I think it is pretty cool.
Ooh, and there is also a neat TedTalk about them, too:
Overall, I think crows are pretty cool animals, and it would be neat if we could find more ways to help them and get help from them.