I've been with DH since 1997. The last year has certainly been the worst. By far and without a doubt. There have been days where my web server has gone down more than I've seen in all the other years combined. Then those days repeat.
For six months I notified them when I saw my server down. They told me they would work on finding a fix. After six months, it was still not fixed. With their new reporting system, it would go down, they would mark it as verified, then mark it as fixed without actually fixing the problem - the server would still be down. I've seen this happen upwards of a dozen times a day.
Finally I sent them a fairly lengthy email on the subject, and they replied blaming growth. I did notice from the time I sent the email to the time they replied, my machines IP changed and since then the downtime has been much less. In 2005, there was probably over 100 outages that I noticed, and countless more that others informed me about. And I always verified the outage with someone on a different network to verify it wasn't my connection.