You can't douse all enthusiasm for a game because we don't know what the code will look like in 2 years. What can we see right now?
1. Great art
2. Cool unique toys/playfield features and lots of them
3. Nothing about the layout that's looks so non-standard that I really need hands on the machine to understand how it feels (Starchild area, WWE ring, etc.). Magna slings is the biggest question mark.
Even without playing games, you can often look at recent Stern reveals and say they look great except the art, the pro is too stripped down, it's a cookie cutter layout, too symmetrical, it's light on toys, it's a crappy theme, the ball is going to spend too much time in that ring, etc. Maybe Ghostbusters can't prove itself as a great game yet, but in my eyes there's almost nothing to be pessimistic about either.