Multiplayer = you play with other players = check
Online = you play through the internet = check
RPG = you take the role of a character in a made-up world = check
It can be argued that the RPG part of WoW is a bit lacking, because you don't have that many choices with how you change the world like you could have with a tabletop game (instead the world changes and you go with it), but then again, the vast majority of console and PC RPGs are also like that. There are very very few games where your choices actually do change the world (Mass Effect, for example), nearly all of them the story is what drives you and you just enjoy the ride. So, WoW is not so different from your standard RPG experience when it comes to video-games.
Maybe the Massively part could be argued in dead servers, but still there are the Finders for evertyhing, still giving you sense of scale so...
Massively = Check.
And there you go, the entire acronym of MMORPG is still in WoW. So, I don't really know what the OP intends to argue against.