For companies to show their mettle on paper, it's worth the buck.

If you expect to really make use of the system and fly high performing all the time. Not likely. Especially in a very large scale company.

Smaller or Medium sized company may benefit from the standardisation, but without the right, competent people, it will likely go back to situation above.

The possible downside of having a management system, is people don't do anything and blames it all on a so called poor system, yet don't do anything to change the status quo. Myself included. As long as it doesn't affect my mental and financial health. Let it be.