I have been with them for a couple of years and the only reason why I left was because the project I used to host there was put on hiatus and I don't need that kind of 'enterprise' hosting for my other stuff.
I agree there shouldn't be downtimes on any of their machines but just going by the headline, you'd think Joyent is unreliable when indeed their own server plans are rock-solid.
You make it sound like they are Dreamhost. That said, hope your problems will get solved soon.