There's more fake "good" reviews than fake "bad" reviews. So there's a little extra grain of salt to keep in the back of your head that the bad review has SOME truth to it (usually).

Granted, an annoyed user that gets terminated for spamming etc might post a review about how they were kicked off a machine for no warning, or that they didn't do anything wrong, but more often than not, when someone leaves a company they spend less time thinking about the bad place than they do looking at the new one.

The larger the company, the more reviews (positive and negative). There's also the companies that get very few reviews at all as people just don't talk about them much. Companies that cater more to ecommerce and small business hosts generally don't have a ton of reviews, because those mom and pop ecommerce clients are spending so much time working on their own business, they rarely have time to help promote the hosting company they use.

For me, bad reviews generally have some sort of underlying truth, but the review will always be slighted by the person posting so as to influence the decisions of others.