Honestly, and maybe I am wrong, but I've always considered the 'world class' thing to be more of a joke than anything else because it lost all meaning after being used for the umpteenth million time. I doubt that anybody is actually crying foul because of the usage of the word and more so just making a mockery of it, similar to how many make light of the fact that Leviathan is advertised as 'World’s greatest family rollercoaster'. It's all puffery at the end of the day.
But for arguments sake, I think the difference in your comparison is that the examples you included are referring to a 'World Class supplier' and 'world-class tourism infrastructure asset' respectively, unlike Movie World which has 'Australia's #1 Theme Park' flat front and center on their website as well as Sea World having 'Australia #1 Marine Park'. I think it does deserve some criticism when they fall short of their brand's hero message and identity.
I'm one of the many that will happily agree that our theme parks fall short in all regards when compared to the world stage. PhantasiaLand is a great example because VRTP absolutely wipes the floor with them in terms of attendance, yet Phantasia turns around and laughs by creating groundbreaking, legitimate world-class products with seemingly relative ease. This has a bit to do with geography, and I discuss it further here, but because of this I don't think it's unreasonable for people to criticize the presentation and business practices of what is advertised as Australia's #1 theme park.
I'm in the privileged position of having visited many theme parks around the world and my bar is pretty darn high when it comes to actually impressing me, but my metric of success as a guest comes down to something fairly simple; how successfully does a park utilise what is readily available to them to improve the guest experience?
And with this in mind, I just don't believe that Movie World at the moment are successfully utilising their available resources. They are performing lots of big picture refurbishments and it's clear that they're considerate of their brand and image with things such as the Royal Caribbean deal to get guests through the gate, but once you're through those gates is when they start failing in many regards on the smaller stuff. It would be fine if it was some things here and there, but this thread alone shows that it's obvious that its not. The guest experience is suffering, and you can't ignore that for very long when you're main revenue opportunity is convincing the public to enter your premium gated venue.
With their neglect towards internal presentation and a further shift towards predatory purchasing practices, are they making more money than usual? Probably! But so is Disney World, and look how their lack of focus on the guest experience is going for them in terms of public perception.
The benefit for Movie World is that with my metric of success it's very easy for them to turn the situation around by placing that focus back on the guest experience, which is also why it's so disappointing that they aren't doing this already.