FWIW, I've been enjoying the shit out of playing on a Vanilla private server lately.
Granted, I didn't join the game until around a year into TBC, so to me, it's kind of honestly, new content.
I'm enjoying the challenge, I'm enjoying the face that there's always 1000-2000 people online on my server!
The world PVP is alive and well, people are out questing, raiding, it's wonderful.
AND SHIT! I got my old friend from Burning Crusade to join my real life friend and I and we have a cute little personal group in a huge raiding guild going. It's great and I don't get why some people think others can't enjoy this. I am enjoying it and no matter what you say, I'm still enjoying myself! What do you say to that?