As others have said, it comes down to the psychology of a person. You'll see far more bad reviews because it's more likely for a person to share their bad experiences when a company did not live up to expectations then when a company does live up to the expectations. It's just human nature to be this way, because, afterall aren't they doing simply what they are supposed to be doing?

That being said, there are good reviews and I've seen a fair amount of them around. It's just natural that you're probably going to see more of the bad than the good for the reasons I stated above.