Ok, sorry about the mole rat post...But imagine if we were immune to cancer, and not burned by acid among other things!

A perfect human would have better than 20/20 vision that wouldn't be degradeable.
http://health.howstuffworks.com/question126.htm

A perfect human wouldn't gradually loose hearing. Can you hear this? http://www.noiseaddicts.com/wp-conte...e_teenager.mp3
I can up until the last second.