Quoted from VALIS666:Wonka was the same story for me as well. Played it at Pintastic, it was fine but 10000000 watt spotlights overhead, 100db crowd noise, and kids running through your legs isn't really the best environment to get a good impression of a brand new pinball machine.
You forgot "table angle set at 4.5 degrees with flipper strength at -5". I hated it at Pintastic and look forward to playing it set up right. It's a good reason to not judge games the first go around.
Wizard of Oz is the only game I've enjoyed a lot more after I've played it some (all on location). I hated it at first and still don't know the rules, but it's growing on me.