No not really, although again the value of the stats all depends on what is being monitored and how, etc. For example, Pingdom can report that an SMTP interface looks just great while at the same time it is impossible to send mail on that port because of a bad disk or another failure somewhere else. We use pingdom too and it is a great tool and transparency is definitely great but any number of user impacting events can and do go unnoticed (depending on how you are monitoring and what you are monitoring...)

A great example is that as I write this, I just realized that our public Pingdom network status reports are offline... I count this as downtime against our global availability stats, but it isn't an event that would show up in my pingdom reports :)