It looks to me like the the feet are not all situated on the corners. The heaviest half of the system is balanced on those feet so it shouldn't be a problem.
Wouldn't you notice this instantly? As soon as you place the PS4 down. Unless I'm now living in a world where people have their eyes all fucked up, where they are unable to tell that an object physically uneven, and if a game is 720p or 1080p.
You rarely touch the console after you set it up though, I'm sure you could easily tell if you poke around with it, but people usually don't, they just put it beneath the tv and probably sit back and turn it on.