What kind of iOS games do you prefer? Ones that you can pick up and play randomly or ones that you have longer play sessions?
For me it would have to be both.
There are times I just want a quick 15 minutes gaming fix and other times where I know I can spend an hour or so just gaming.
My gaming platform of choice used to be my pc but as age caught up with me and arthritis hit the old mouse and keyboard hands, I had to find some other medium.
Console was no good as a gamepad is too hard to hold for long periods.
So touch screen was a natural choice.
And being a rpg/strategy type gamer there are heaps of quality games on iOS these days.
I know that mobile games are were probably marketed originally to gamers who just wanted to play a quick game on the way to work or something but as the hardware has improved so too have the games that are on offer.