Ugh, I'd really get frustrated with an iphone to play *any* game. There's no tactile feedback - in case you don't know what this means: a button "clicks" when pressed so you know it has been pressed. A touch screen has zero tactile feedback and you often hit the wrong button. With an iPhone being that small, adventure games would be annoying to play unless you used a pen instead of fingers and even then ...
I used to believe the Nintendo DS was ideal for adventure games as well but it's just not the same on a small screen. I played several games and while they're technically playable, they're not as enjoyable.
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