Review sites in general are very helpful in making your purchase decision. Especially when it comes to a weight loss product, they provide insights you might not otherwise have to figure out which is the right product for you.
There are many good weight loss products available online, but only because a product is good doesn't mean it will work for everybody.
Some people lose weight well with very strict instructions and others need to be allowed more flexibility in order to succeed. That's even something Weight Watchers discovered and that's why they have a second program in addition to their strict point counting system.
Other people don't like to diet at all and prefer to exercise instead. I always recommend combining the two. Clean up your nutrition and get moving to expand more calories.
A good weight loss review will be written by someone that has actually used the product they are reviewing, and I think you'll easily be able to tell.
On a good weight loss review site, you can often get a product tour that is not even available on the sales page for that product. Getting a sneak peek like that is a great benefit!
If this is the very first time you are trying to lose weight, the product you choose might still be a hit or miss. As I said, there just isn't one product that fits all.
I encourage you to not give up, though. If the first product doesn't work for you, do try another one. You never know when you find the program that is just right for you and that will make you fit and happy.