The reviewer is from www.venturebeat.com and from a player who has played Vanilla plus other expacs.
I know its one persons point of view , but its a good read from a very experienced player.
http://venturebeat.com/2016/09/20/wo...legion-review/
Legion doesn’t succeed just because it offers an incredibly deep well of content. It succeeds because of the high polish on everything, from character design down to the humblest textures and dialogue lines. Legion feels like Blizzard gathered a huge group of developers and instructed each of them to take a small snippet of the game and make it perfect. It’s that good.