I think it's wrong to assume any influencer, blogger, or theme park pundit is, in essence, in the tank for any particular company based off one or even a few reviews. That's not at all enough to even guess what their motivation is. Don't accuse someone of being a "shill" just because you disagree with one opinion.
However, if some content creator in this space never reviews anything unfavorably -- why wouldn't the audience reasonably question their perspective and what their motivation may be? There's no way I could trust a person that can never seem to say that something in a theme park isn't worth the money or just straight up sucks. We all could name some experiences in Disney and Universal that fit those descriptions. I also wouldn't trust anyone who reviews everything negatively either.
It sort of comes down to who you're serving through your content. To me, it should be about informing your reader, listener, or viewer and maintaining their trust above all else.
Now let's be very clear who is to blame for this environment in the theme park space: it's the fault of Disney and Universal and other theme parks.
We know, and all content creators know, that bad reviews and criticism do indeed get punished by PR reps. If that wasn't the case, and perhaps if media event access was only contingent on following and reach and nothing else, the audience could trust that each reviewer was being honest. But as long as someone is willing to play ball and say everything's great no matter what, this is our reality.
I think it would help if theme park content creators injected a level of journalism-style ethics into how they gather and present information, but I think that's enough time on my soapbox for now.