I think the most impresses about bitcoin is anonymous, as we know that the current privacy requirement is very important and bitcoin has understood it so it makes me very happy and likes the anonymous features.
To be honest man, i don't think anonymous is the right word to use because bitcoin clearly, cannot/doesn't make anyone completely anonymous. Yes, there can be anonymity to am extemt but not complete anonymity. But putting that aside, there are so much more into bitcoin than profit amd anonymity. And i wish a lot would realize this.