Aside from the fact that I'm glad I used a unique password for my Mt. Gox account, I look at this incident in much the same way I look at the Amazon Web Services outage of a couple months ago (which I was also affected by.) Some AWS users left claiming they had lost faith in Amazon's ability to keep their systems up, even though up to that time Amazon's record had been exemplary. My feeling was and still is that this sort of thing would only strengthen Amazon, and that while failures do inevitably happen, this failure would be extremely unlikely to happen ever again, and a whole class of related potential failures would never happen at all. So, unless Amazon, and by the same argument Mt. Gox, shows a repeated pattern of failures in the same category, I think it wise to stick with them.

There's a lot of truth in Nietzsche's statement, "That which does not kill me makes me stronger."