A friend and MIT alum went back through Sloan for a foundation he felt he needed to assemble a venture around IP he'd developed. Approaching it again after, he told me effectively what you described - while he felt he got "executive training", after trying and failing, it didn't provide practical knowledge to build and manage a successful operation.

Instead, he hopped in the helm of an existing company and has done well enough with it. It was superset training, in the end.