This is so weird. I played original Vanilla, TBC, Wrath, Cata, MoP, Wod and Legion and my impression is that WoW is overall a spawn of Satan, a monster that killed Warcraft and devoured it corpse.
Vanilla was cool, because it enabled to experience Warcraft world from the whole new perspective. I think Silthid/Silithus/Ahn Qiraj was the beginning of the crap, it felt strange and I believe it's the first major thing that was disconnected from original Warcraft lore.
When I heard about Nostarlius server, I jumped in to see how it will be cool to come back to Vanilla, and it was fun to experience old world and it's dungeons, raids and quests.
Well, it was a fun for a while, then it became stale and boring, because of no new content.
I think that new expansions throw life into this rotten and twisted game, so I wonder how the new Vanilla will turn out after a 2 years of existing.