I mean... I was 11 when the most recent park on my list (Animal Kingdom) opened, so I wasn't in a position to be clowning anything!
In hindsight, I certainly think Disney-MGM and Animal Kingdom are deservedly looked at with skepticism in terms of their opening day/year line-ups (though, yes, there's all kinds of additional context with MGM in terms of how the company initially viewed the park as an intentional half-day experience).