I just closed my City of Heroes account. I was initially disappointed by the game, then grew to like it, now I'm bored again. I hadn't even played it in several weeks and won't for several weeks more, so I quit. That's $15 / month I'm no longer blowing.
It's weird quitting a MMOG. I feel like I'm killing my character, the one I invested so much time in creating, building up, and being. Goodbye, Dr. Jellylove.
Truth is there's a lot of quality games out there and I don't have much time to play them. I'm a fiend for innovative gameplay and get bored quickly with games. CoH has really dull gameplay, repetitive boring missions, and it's not going to get better anytime soon. Not for me.
It's still a cool game, worth checking out if you're curious.