I think it has some merit, as far as it goes. There's no explanation of where the singularity came from. Why did it exist in the first place, where did it come from, and why did it explode? It serves to prove that Einstein was right when he said, "energy can be neither be created or destroyed, but can change forms."
The above theory just never had much appeal to me. But I read a book, a few years ago, that put forth another theory. The author, an astrophysicist, stated that the universe always existed. Why not? For some reason I like it better.
They are all good as far as they go. There's no theory that I know of that can create something from nothing.
What do you think, from a scientific perspective?