This!

I still hands on a couple of groups though the traffic there is getting thinner with each day...

It was simple. I wasn't forced with account (though would be nice/useful nowadays I guess with all the impersonation and whatnot), threading was awesome. Scoring+plonk was even more amazing. There was a problem with syncing what was read and not but that could be easily improved now...

I think I mostly miss scoring - it was such an amazing tool to manage/filter out desired content...