To expand a little on the Final Fantasy subject, when the second Final Fantasy MMO launched, Final Fantasy XIV, it was so bad that people that played it claimed it could barely be called a game. It tarnished the Final Fantasy brand so badly that Square pulled the game and assigned the guy they had with the most passion about the Final Fantasy franchise to completely redo it. They announced they were going to do this on October 14, 2011, roughly 13 months after launch. They took the original version down November 11, 2012 and re-launched on August 27, 2013 as Final Fantasy XIV: A Realm Reborn. The redone game was vastly improved and a huge success, and the guy in charge of the relaunch of FFXIV is now in charge of all things Final Fantasy at Square.
So MMOs can come back from the dead, and CoH has the advantage of not being a terrible mess beforehand.