What is it with all the hosting companies get assaulted? Or maybe it was something they did (have not searched extensively). Anyways just wanted to throw this out there in case anyone has to do damage control (like me..)
I've been using MT's grid service for a about 2 years. About a year ago my websites started being unavailable for brief periods of time (<30 minutes) at increasing frequency. In november I moved away from them, at that time I had on average one such mini-outage per week.
I've actually heard the opposite. I was planning on moving from BlueHost to Media Temple Grid Server. I know neither are top-of-the-line-or-even-close services. But I don't have any 24/7 mission critical projects either.