I'm always up for some constructive criticism. Note that I said 'constructive.' "Your story sucks" doesn't help me write better stories, while a comment like "I think you developed the plot too quickly," or "You could have given more detail in this particular part" can help me. Who knows? I might even edit the story with your suggestions in mind.
Also, thanks to a couple of readers who have pointed out some glaring typos in a couple of my stories. I'm my own editor, and I think I do a pretty decent job, but I'm certain to miss something now and then.