I wanted to get a strategy thread going for Wizard of Oz. I've found these threads to be very helpful for me with other games.
To me, it seems like there are two ways to play WOZ, and they are not mutually exclusive: for points or for the quest.
When I play for points, I try to stack modes to maximize value. My favorite thing to do is to get the twister ready to start Munchkin Frenzy while also having it on the last lock to start ECMB. I start the multiball, try to hit the first ball up into the twister, ignore the other balls for the moment (there is a ball save for a while), and hit the munchkin loops to start Munchkin Frenzy. The points you get from Munchkin Frenzy when all switch hits score big points during a MB can be pretty insane. I also try to start a crystal ball mode at the same time for 2x scoring. Most times, this doesn't work out for me, but I have been able to get this trifecta a bunch, and it is really exhilarating and lucrative.
As for playing for the quest, I've been pretty good at advancing myself to the witch battle. I've melted the witch a few times, but it is still a rare event. One thing I haven't been able to do, and it seems incredibly difficult, is finish Rescue MB. I'm curious how many people have done this and what tips they have.
I'll post back with some other thoughts, but I would love to hear from others about how they play and what strategies they follow.