Here's a couple more.
This game is female-friendly. Oh yes, I know about the chest slider pushed to the right, and the minikini costumes...but a gal can build herself a toon that is covered neck to soles if she wants, and the players are about the least sexist I have come across in any MMORPG (one of the many reasons why I stayed). The number of harassing teenage jerks is remarkably low, and when anyone starts, a dozen players jump to the rescue. Not to mention the high number of good female role models in the canon. Market this game to girl gamers and you will see a lot of them come and stay.
This game's UI is easy, and intuitive. One of the reasons I didn't play Tabula Rasa outside the Beta--which I paid for--was the UI.
Yes the game is 8 years old...which, my friends, means it is just about time for all those folks who started families and quit to get nostalgic and now that the kids are in school and have their own interests, hearken back to those fun nights of button mashing. In other words, CoH is on the edge of a rising number of return customers. That is only going to get larger, the older the game gets. The UI is the same, picking it up again is like riding a bike again, but oh, how new and shiny and so much easier it is to play. Gone are the days of sweating through the lower levels for weeks. Gone are the days of the agony until you got a travel power.
Which brings me to--
The game is senior-citizen friendly. The retirees of today--my generation--grew up on comic books, Star Trek TOS first-run, and B science fiction movies at the drive-in. The retirees of today have to be very careful about their budget, and need to get a lot of entertainment out of a dollar. The retirees of today were the first to see video games--and spend their money on them, with enthusiasm. Were the first to have PCs. Are comfortable with the internet. The UI for CoH is simple and intuitive, and unlike twitcher games, doesn't really require a phenomenal amount of hand-eye coordination. If you don't PvP, it's easy on those of us with slower reflexes. Plus, the socialization, the community, is warm and welcoming for those of us who feel isolated by our age. No one knows how old you are--and if they do, they either don't care, or think it's amazing and cool. This is one reason why my father in law plays it. It's a way to connect with your younger relatives at far distances--another reason why my father in law plays. And VIP for $15 a month is cheaper entertainment than a cable subscription. Think about it, the possible ads in AARP....."Remember, when you were a kid, you wanted to be a superhero? Now you can. Come fly with us."
Anyone who is blind to the possibilities of that last has to be insane.