On the contrary, I think the execution is about as good as it could be. The set is impressive, the costumes are elaborate, and the cast are giving it their all.
It’s the concept that’s lousy.
The characters have no reason to exist in the same universe. They have no reason to sing these songs we’ve all heard before. There’s no reason for the pep rally-style popularity contest. There’s no reason to not have better connective tissue, like a plot, background performers, or musical theme woven throughout. There is no dramatic arc, no stakes, and nothing for the audience to care about. It’s all superficial with no substance.
On the technical side, it’s a nicely assembled little production. On the conceptual side, it was doomed before it ever got off the ground.