My reviews at ReviewStream were all rejected

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I learned about Review Stream only last week. I was so excited I submitted more than 10 reviews for them already. I reviewed my cupcake maker, my pocket wifi, a restaurant, a movie, a pill, etc. Unfortunately, none of those reviews were accepted. I followed the guidelines: no plagiarism, make it conversational as if you're just sharing your experience to a friend. There's no exact word count written on their FAQ page, but I researched and found that it should be at least 250 words. Some users even say it should be around 500. Thus, I kept my posts long enough hoping not to be rejected. I also did some research on how to write an effective product/book/movie review. Include the pros and cons, describe your expectation, state more opinions than the description, how did you obtain the product, where to buy it, how much, etc. I also spent time reading the digest, to get some ideas how other reviewers do their work. Some have very lengthy post while some have brief posts. I listed information that I know will be helpful to other readers. But it's just so sad they did not buy my reviews even at a bulk rate. The reason was "review is not specific enough". What kind of specific they need? I can't see any supporting detail of what specific should be like. I really want to see my reviews published. Please help. What's your experience writing for ReviewStream?