I think it's fun for 10 minutes, but it's not for [i]serious[/i] gamers. I do enjoy playing GTA: SA and Minecraft PE on my iPod, so it is a good time killer and if you find the right game, who knows.
Is it really that enjoyable on the ipod/iphone? I had pretty much made the assumption that those were more for the iPad, it just seems it would be clunky and annoying on something as small as an iPod/iPhone.
They're absolutely fine on ipod, just with a little less draw distance