One of my big problems with the Sterns is I have never been impressed with the artwork. Now, they've come along way since the early titles like Austin Powers -- that looked like somebody printed it out on their $39 HP Deskjet on economy print mode and glued it to the playfield.
But they still have a long way to go before they get into classic Bally/Williams territory. Actually, I doubt given cost concerns and what not that they ever will. First off, since everything is a license they usually just have photo-art instead of actual drawn art. Now some people can complain that the old pins with hand drawn arts in many cases looked nothing like the characters they were supposed to represent (and this is true) but in many cases I still liked them.
I really dig the old school pinball art, especially on the 80s stuff (ironically the early 80s sterns are some of my favs). You take an older game like Fathom, Iron Maiden, Flight 2000.. well even if you don't like the way they play damn if they don't look totally awesome. It's hard to capture that feel with the still low res 'scanned' in looking stuff Stern uses today. I'd imagine it all has to do with keeping costs down, but it's still kinda sad. Even when they have actual drawn/painted 'art' on some games it just doesn't have that same feel.