The leak is from 2012, which might explain SHA1 usage. It should still have been something beter, even for that time, but still.
Anyway, I think it's pretty hilarious that we're now patting companies on the back after leaking 17.5 million user details. Not that Disqus' disclosure wasn't text book. Just that it's now so normal for companies to leak things all over the place that we actually have Best Practices for what to do when (not if ;-) that happens.
Personally, I don't register with my real name and email anymore, anywhere. It's a bit of a pain in the ass sometimes, but worth it.