Hijackability is probably a feature of most consumer grade devices - accidental or not. What Lenovo did was a specific attack that enabled them blatantly to inject their own content and also did so crappily that it opened a whole back door. It's not like I expect my outdoor to be burglar proof. I do expect, however, for my door manufacturer not to give out keys and assist the tupperware sales reps to help themselves in to my living room.