I don't think that's quite fair. No server is 100% reliable, and that says nothing about the quality of the code of the project itself.
What does open source have to do with the reason your site was down?
I think that impugning the professionalism of someone's work because their project's home page was down once is pretty darned personal.
It says nothing. All servers go down from time to time. This one was up when I went to it before, and it was up when I tried it again just now. You say it was down for you when you visited it. Fine. That happens sometimes.