Honesty Pays Off
Write about products and services you use or have extensively researched. Phony reviews that just promote your affiliate links will not help you in the long run.
You want to build your reputation as an authority in your chosen niche. You do that by providing quality content and that includes honest reviews.
Make your reviews personal. Tell your audience how you use the product and how it helps you. If you don’t currently own the product or use the service, explain why you want it and how you expect to benefit. If you don’t like a product say so in a professional way.
Positive vs Negative Reviews
Most of your reviews should be positive. You are trying to subtly get people to buy these products after all.
You should include the cons along with the pros to keep your reviews honest. Just make sure the pros outweigh the cons in your positive reviews. If you can, explain how you work around any drawbacks in the product.
It is alright to throw in a negative review once in a while. It adds to your credibility and can warn your readers away from poor products.
Make sure your negative reviews are as honest as your positive ones. Don’t ever bash a good product just because it competes with one you market. Only write negative reviews about products or services you honestly believe are poor quality or even dangerous. If you trash good products, your comment section is going to be flooded by defenders of that product. You can delete or ignore those comments but, your credibility will still go right down the drain.