Both of the above post are true. Reviews at like retail places like Newegg/Tiger and so on is a 50/50 thing. You dont know how many of these people are idiots or have any knowledge. But if any item has over 50 reviews and gets like a 17% good reviews, you can pretty well guess its junk. Or the opposite is true too, if it has over 50 reviews and get a 97% good.
The reviews on sites said above like jonnyguru can give you a good idea of how well its built and if it performs as good as its spec. But since they only test one unit. You have no idea how many of these units come DOA or just has a bad habit of burning out in a short time.
So put both of the above together with word of mouth from sites like this to make a good decision and go for it.