AoC lost a far greater % of their players post launch since their game didn't even work (like... legit did not work at launch. You think swtor was buggy? Ha. funny). If you were around for AoC, you thought swtor did pretty well.
Aion went from 8 million to like 1 million. I wasn't participating in that game at that time, so I don't even understand how that happened.
WAR was DOA. Most people saw that coming when they scrapped a whole bunch of classes right before launch. (thanks ea)