Product reviews are evaluations of a product, a company or a service, video game, book, car, home appliance or computer. These can be written on just about any area where a buyer is going to exchange money for a product of some type.
In addition to evaluations that are critical mcdougal of the review might give the work a rating as an indicator of its relative merit in its field. Moreover, authors might review current events, items or trends in the news. In fact a collection of reviews alone might be called a review.
You bet they are useful, particularly when you are going to buy something expensive : like a piece of electronic equipment and you don't even know the place to start. The same with computers : if you are ready to buy the ultimate computer system, you must know the place to start looking. They are very helpful when you are ready to spend some of those hard-earned dollars of yours. It might be tickets to a display but do you want to waste your money if the display was a failures?
Normally these pieces are written by 2 types of writers : the consumer, and the overskudd expert. The product expert ordinarily a marketer for the company making the product is going to inform you of the features of the item and will also be writing mostly privately of the product being wonderful and you just have to have it.
The consumer review is when someone has already purchased the product and provides their opinion of the item. These can be really bad reviews of the product or really good reviews of the product. Anything in between, the consumer is not going to take the time to write.
The best thing to do when thinking about a big purchase is to find and read all the product reviews you can. And somewhere in the middle ground of all reviews you will find the truth about the product.
In situations where you have had a terrible time with a new product or you have had a really good experience, why not allow the next consumer know what you think. Particularly when it was an entirely bad experience and you don't want your fellow consumers to waste their money.
Another reason to write reviews is if you want to be looked to as an industry expert in some field : say computer equipment. If enough people start seeing your well written reviews with your name about any computer equipment eventually you will get the standing of being an industry expert in that field. But to be a market expert you need to write reviews that are full of knowledge and are also insightful new. And they need to be a true expression of what the product came down to like.