People have a right to be upset. A day out at a park for a family of five runs you up several hundreds of dollars, and if your whole day amounted to ~8 hours of sitting in queues, you'd feel duped. Park-wide closures due to the weather, slow loads/unloads, 3-4 empty seats on ride cycles, single-train ops and so on all compounded together are giving paying guests a less-than-satisfactory experience, so of course they're going to speak up.
Neither Dreamworld nor Movie World have enough attractions operating to keep up with demand. They're taking proactive steps to address these issues for the future, but in the interim it's reasonable to say these school holidays are not the right time to be visiting.
I'm not going to rant about it in a Google review, but it's all stuff I've observed this past week, and you can feel the frustration amid the wearied atmosphere. Lots of families are giving up and leaving by lunch time. That's not a good thing for the parks or their staff, because though they've got the gate fare, they've got unhappy staff copping abuse, families not spending as much on food/merchandise, and a generally negative perception which diminishes return visitation.
Was at DW today and because I somewhat know the daily crowd cycles, I was able to get my party a pretty good day out of it. We were there for ~5 hrs (yes, we got there very late) and got six different rides in, with a re-ride on ST at the end. I count us lucky.