Honestly here is the point why people say WoW Clone. Although Wow is not the first of its kind it IS the most successful MMORPG at this time, so while these new MMORPG's may be great, if it isn't innovative enough it will die away due to the fact it cannot get enough people do to WoW's already establish subscriber base.
Thus every game will be labled "WoW Clone" (I acknowledge there WAS similar games before it) unless it takes on a entirely new type of gameplay or else there is a large chance it wont get enough subscribers to support it.
Thus people stick with WoW due to the fact they are used to and put a lot of time/money into unless they can find a game that is so much better, they stop playing WoW and switch to the new game but the problem is that this game honestly isn't, and I bet the success of this game will be minimal.