When I was using it, I was getting timely, interesting emails on a weekly basis about startup companies and silicon valley inside information. After receiving an email with an interesting topic I would spend about 45 minutes browsing similar topics that interested me. To sum it up I found Quora to be a very informative source of entertainment.
Now, over the last month or two the emails I've been getting have been ridiculous topics more fitting for entertainment weekly than YCombinator.
On one hand I hope it returns to the level that it was in the past. On the other hand there may not be a large enough user base with my requirements for the owners to create a viable business so I would be understanding if my needs where disregarded in a pivot.
I've also come around to the boards feature. I originally hated the whole concept because it seemed like noise in what was a pretty good source of signal, but eventually it settled down a bit more. Most people now seem to use them the way I do, just as a place to dump interesting content or things I want to remember later, rather than a way to spam one's followers with uselessness.
Having said that I sometimes find it a distraction as there is plenty of 'curious' stuff going on that could become a time sink. So I stay away from that on most days. :)
It is great for startup questions (financing/vc things), but otherwise isn't that compelling.