There's so much useless information or unverified information around on the net these days unfortunately.
For instance, Google doesn't like review sites with affiliate links to Amazon products and in turn you will find it hard to rank for a site which is promoting products.
On another note, reviewing these products is sometimes pretty hard to do based on the fact that it helps if you have the product, unless you read a review then write it in your own words. But your basically copying the idea and competing against those sites.
Any tips or advice from anyone who has review sites for products on Amazon, general guidance on what i should be focusing on would be helpful.