People and customers have their own ideas and personal insight about decisions they make and big names in web hosting industry may not necessarily indicate feeling satisfied with the purchases. Searching the net, you will find hundreds of forum posts made by people who are dissatisfied with shared hosting accounts they have bought from companies and some of the names are big ones.
Even top rated firms may turn to bad after a while due to tens of reasons like overselling, lack of support and using unreliable hardware systems. Of course the real art shown by professional webmasters and companies' admins is to keep their older customers satisfied through providing them with reliable hosting packages which are uptime mostly and loaded with great features that beat competitors' bundles.
One of the reasons why a few companies have managed to have tens of thousands of customers worldwide is because of their older and returning customers' ideas. Since they are satisfied with their purchases, so they will renew their accounts almost every year and even talking about the firms while visiting blogs and discussions forums, spreading the word about the companies and boosting their popularity.