for me 10/10 for vanilla.
And i don't really see what you guys see good in tbc, it's expansion where it all the bads laid their roots.
I'll just copy/paste my response from other topic.
"1. Epics are epics - no other mmo cant provide you that feeling.
2. No hotkey based queue content - only AA comes close to vanilla wow here
3. Best open world pvp experience ever
4. Not everyone can have everything. I know I won't be able to get into some raids cuz of my free time and generally my gaming attitude and that is JUST FINE. Not everything should be accessible to everyone. Know your place in the world.
5. Overall difficulty. Yes, boss mechanics are some basic stuff in compare to WoD or whatever, but seriously... Every boss fight past tbc is faceroll or very close to it. And that is only because players are overpowered even before they get to the boss. Avoiding fire and some telegraphs on ground or whatever isn't what I consider a challenge. Lets log into my Wildstar account and see how many times I'll stay in red

Avoiding stuff is easy "super-mario" like mechanics. Vanilla-wow provides you with challenge of preparation, team coordination and patience! Only because of that, I can tell that I respect PvE players almost equally as PvP players here, which isn't a case on any other game."