You should consider jailbreaking, Henke. I've been playing Maniac Mansion through ScummVM, and even on the tiny iPhone screen, it works beautifully. I could imagine the experience would be that much better on an iPad.
And my personal theories about touchscreen gaming have been confirmed. The iDevices are a perfect fit for RPGs, strategy, and adventure games. But for genres that normally rely on an analog stick or two, it absolutely BLOWS. I tried the Chinatown Wars demo, and couldn't even stomach 5 minutes with that fiddly faux analog BS. Same thing with a digital control setup. Even when your movement is constrained to up-down-left-right, a'la Zelda, it's still feels sloppy and unresponsive.
Maybe it's the games I played. I dunno. But for now, I'll stick to the more point and click stuff on my iPhone.