Nothing has really yet replaced it in quality, but that is only due to the stubborn userbase that clings around. Even us stalwarts will eventually give up the ship, though and say goodbye to our three and four digit UIDs after being thoroughly fed-up with the direction the site has taken.
I keep looking for a new home on the internet, after about seventeen years on slashdot. I haven't found one yet. Places have a user base that is too fleeting. Or a poor signal to noise ratio. Or a poor curation/submission process. Or a poor discussion system. Or awful moderation. Or too much moderation. Or they mix in too much non-tech/geek content.
Really, it is kind of sad. It was an almost daily part of my entire adult life, stretching back to late '97. That, usenet, and IRC have been the most enjoyable, content-filled, tools I've ever found and each filled with a great group of people.