I know bitcoin has great potentials and I also know that there are some bad user of bitcoin like any other currency. But my point is, those bad users are a lot in number. I have seen thousands of posts and comments regarding uses of bitcoin in  porn and gambling. You can find it in this forum with minimum effort too. And as bitcoin is not globally adopted, those users really play great impact on impression of btc, I guess majority of usage people get from bitcoin is only as an investment and for trading. then the second place is for payment and third with close rank is gambling. the rest are a relatively small in percentage.