Are you saying that it is not a 'good' backstory because it has defined characters? Or it's not good because it has a 'begininng' per-se? As the article mentions, Tower of Terror "adds layers of depth to the experience--heightening the sense that the guests are visiting a real place with a real history." What makes the Paradise Gardens any different? Sense you are visiting a real place? Check. Real History? Hmmm... immigrated family, one venue.. then two.... the original smaller, the second larger... history? Layered history? I think so.
The backstory sets the stage for what's happening now. We understand how the dining establishment came to be, but it's not spoonfeeding us what's happening right now or where it's going to end up.
Of course, I could be looking at your response completely wrong, as I'm not exactly sure what you're trying to communicate to me