I notice a few XIN holders here love XIN so much that they could only see the positive side of XIN. This is typical in Behavior Finance. This typically happens when a stock consists a large portion of an investor's portfolio.
However, in order to succeed in investing. One has to look at both positive and negative sides of his stocks in order to make the right judgement in case a once good stock goes in the wrong direction. This is like you make friends. You know your friends' pros and cons. You keep good friendship as long as pros outweigh cons. Otherwise, you do not have to keep the friendship. Investing should be like this way.
Your post is a cliche without facts. Of course it is possible to be too enthusiatic about a stock. But all the objective analysis of Xin suggests that the market is UNDERVALUING Xin. I have taken some profits during the 100% move up. But the stock should be bought on any significant pull backs.