I know people are saying that they are happy playing on other servers, or waiting for the release of the next hyped server, but we had it pretty good on Nostalrius.
The staff were very professional, I am playing Kronos 2 now and there doesn't seem to be any unified direction or strategy when it comes to dealing with bugs. The tracker is full of issues with different responses from multiple GMs in a single topic. Some deny there is a bug, others state they are going to leave a mechanic that is not working in a blizzlike manner because they think it is better.
The majority of the playerbase always strongly supported staying true to a Vanilla WoW experience. Rebirth WoW and other servers often have bonus experience gimmicks to try and fast track people to 60 and they wonder why they aren't developing any new committed raiders.
In short, this place was the best and I was priveleged to play here for almost a year.