The last day.
I had several licenses and play from the time they started. Paying $15 bucks a month for 4 people was expensive but I hated when they went to Play For Free, that is when the problems seem to happen. Servers crash day one... I hated it at first. Loved it when Freedom started and I could take my Villain to the Hero side. There is still nothing out there that comes close to COH/COV and I am/have played them all, nothing holds my interest for more then 100/hrs ish. The very last month of CoX I didn't even get on to play, my disappointment was off the charts. Now the one thing I wish I had done... Is be there with everyone on the last day. And I wish I had a screen shot of my Dark Zomb and crew (pets). He was BAD ASS and I have no doubt I would have framed that screenshot and that pic would be on the mantle with my Grand Dad. lol...
Remember the last pets they added the Demons, fun to play but that one would howl every 2 to 5 minutes, OMG that drove me crazy! I miss it now. lol