You are basically calling macdonalds "the best food ever on the planet".
Therefore its obvious you are talking out of your butt when referring to vanilla since the only experience you have of that is through private servers. Facts for you, I don't care about nostalrius because there is much more to a multiplayer game than just pure content or technical specificities.
But hey keep telling yourself that WoW is just getting better and that no other MMO does something better because "lol it has more playerbase so its good".
MMO genre is dead since several years, and WoW is just a farce impersonating an MMORPG. There is nothing RP about the game since ages
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Um no this is the usual misconception about RPGs. Playing a ROLE is not just picking a class and doing dungeons and quests like you do in diablo. Playing a role in any good RPG supposes having the notion of choices and consequences and freedom of destiny. Where is that in WoW? Does your character have any dialogue option? Any say in how he wants to handle things? What he wants to do? No you are basically on the most extreme theme park possible which is something alien to any good RPG. Hell everything is so combat focused in this game (while the war aspect being handled pretty badly too, the irony), that you can't even be a diplomat, a pirate, politics, nothing of that exists in this game. WoW is about as subtle as a hack n slash and most recent MMOs have been tainted by this everquesty-grindy-diabloesque design
Ask any good table top RPer out there, D&D wasn't about "muh killing dragons muh getting this +3 sword" it was about impersonating and developing your character like a real human being, not just a robot that kills stuff and gets +50 stamina.
https://www.youtube.com/watch?v=PIalyAYLd0I