Quote From Dunham:
I agree with pd1598. There are tons of people who achieve that goal and as an examiner this is probably routine. So i wouldn't be surprised. For them, it is probably an average PhD thesis. Nothing major to complain about, but also nothing to be excited about. For the individual it is of course a huge achievement but not necessarily for an examiner. However, I think you should at least congratulate at the end (I hope they did).
Of course it is nothing exceptional, it's just a thesis, like the millions of others out there, but I still think there is a way to conduct vivas that let the students know the limits of their work, without thinking that it's all totally crap.