This is smart TV software done beautifully. It (seemingly) has more functionality than Apple TV and (looks to be) better integrated with movie purchasing services than Dlink’s Boxee Box. The problem with all smart TV devices remains their stability: I’m a geek, so I don’t mind occasionally reseting my Boxee Box or media centre and I accept that periodic crashes in the middle of a show or movie are the cost of early adoption.
Most people aren’t geeks. Most people won’t settle for sometimes crashing TVs. If Ubuntu doesn’t get that element right then everything else they do won’t matter one bit to the mainstream. Though us geeks will likely love it.