There isn't a working jailbreak for AppleTV3. People have injected themselves into the existing apps changing where they look for video, but that's different to having local root.
Ok, but the GP said "Good luck unlocking/hacking an Apple device" not "... an Apple TV 3", implying that Apple devices are impenetrable fortresses of doom or something.
Full-blown iOS devices get jailbroken pretty quickly. I assume the difference here is that no one cares about the Apple TV, so there's little incentive to hack it (exaggeration, but the difference in Apple TV owners vs. iPhone owners is probably several orders of magnitude). Even if you did hack it, what's the point? There's no hard drive to store your pirated videos, and IIRC these things can stream videos from your PC out of the box anyway. If you're gonna install XBMC and bypass the Apple TV interface completely, why get an Apple TV in the first place?
Good points. I should've been clearer. I meant the scene is not such that there is enough work done that a relatively non-techie person can sift through the jailbreaking community work and apply it him/herself.
Many "hackers" seem to magically stop caring about hacking devices if they're made by Apple. Clearly they must have been perfected prior to release, so there's no need.
Good luck unlocking/hacking an Apple device.