The majority of reviews you see on consumer sites should be taken with a grain of salt! When buying computers and accessories the only reviews you should trust are those workshop type reviews undertaken by professional and independent experts. As Plato said, do not trust the opinion of the major but only that of experts.
There are two main reasons for this.
Firstly, many people compare to products that they have owned in the past. For example, if you owned one of the first 1 mega-pixel digital cameras to be released and today bought a 9 mega-pixel camera, then of course you will think it is great! You might even excitedly write a glorious review saying as much.
Secondly, most people do not have the opportunity to thoroughly test other cameras in the same price range. Some of these may be very superior! Reviews in magazines, for instance, will review many cameras at once, not just one particular model in isolation. These reviews should hold a lot more gravity for you.
Another point to consider is that even good companies can release bad products. You need to be certain that the model you are about to buy is the one that received a good review.
Of course, sellers do not care about such things and will sell whatever they can find, with little regard to the quality of the product. They will sell old models or crappy models without hesitation. Do yourself a favor and do not buy lemons! If you want to buy the best computer, laptop, hardware or electronic product then try and read a comparative and comprehensive review first.