Many of the newer stern machines I've played locally that are out for public use are pretty much wrecked. There is a local bar that has Metallica, Walking Dead, Avengers, Iron Man and Pirates and of the 5 machines only Iron Man is playable.
Metallica - broken pieces of plastic laying on the play field. Ball cant even drain without shaking the machine to get ball over plastic
Walking Dead - Out of order sign on it
Avengers - Ball get stuck under the hulk and left bumper broken
Pirates - broke plastics
These games are all Stern and all not that old. I know the the Metallica and Walking dead were setup brand new this last winter so they might be 6mos or so old. Obviously no one is taking care of them but I remember Williams machines in bowling alleys that would go years without maintenance and still be functional, albeit not perfect. Just seems the newer machines are built like everything else these days, cheap!