I'm a pinball newbie, so keep that in mind.
I think WOZ has some really neat features - the backglass screen and rainbow LEDs just feels like the next step in pinball's evolution (like going from 7 segment displays to DMD). I think Stern need to follow this lead.
The machines I've played have all felt solid and smooth like no other table I've known. I also like Toto and State Fair ball save mechanics, which I think are unique to this table. Although the latter seems very hard to execute.
However, I don't think it's a classic because the playfield itself has neither the flow of MM or the toys and modes of TAF or TZ. Shots don't feel bad, but they also don't feel great.
Whilst I love the theme, I think more could be done with the sound, music and lights. It should be loud and busy – I don't get the feedback I want when I start multiball, for example.