How many words do you have? For an article online to be really good it should be between 500-1000 words. Your content can also get flagged if there isn't a lot of text and you have a link or two.
Ask yourself if you are answering all questions your readers might have regarding the subject you are writing about. You should be able to add another paragraph or two and that should help you meet hubpages standards.
Make sure your hub is informational and useful to your readers. You want a well rounded article that people would search for in google.