There are a lot of reviews out there however very few of those doing the reviews actually go out and buy the stuff they review.
What happens is that they get sent a sample from the manufacturer and then the reviewers test that and publish the results. I call this worse than useless! Obviously the manufacturer is going to send out a tweaked unit that in many cases bears no resemblance to the lemons they sell retail to the customer. They can however point to glowing reviews praising the quality of their product.
I would thus suggest to you that the next time you see a glowing review of a product that is cheap then you might want to take that with a HUGE grain of salt.