I'm OK with the interface, too. I hope that in a future iteration we will be able to mirror the aTV on an iPad (an App) and re-arrange apps 'normal' IOS style. The apps I don't use such as the NBA I'd like to hide or get rid of. If my TV navigation experience was customizable similarly to my iPhone and iPad experiences I'd be very happy.
Why would you want to mirror the AppleTV to the iPad? That seems redundant. Everything that's available for streaming on the AppleTV is already on the iPad. Unless you're talking about streaming from your local computer, in which case it would make more sense to release an app that duplicates that functionality.