The phrase "a much more devastating" is correct and usable in written English.
It can be used to emphasize the severity or impact of something in comparison to another situation or event.
Example: "The storm caused a much more devastating impact on the coastal towns than initially predicted."
Alternatives: "significantly more destructive" or "far more catastrophic".
I think we're split in a much more devastating way than psychology can ever reveal.
Because so few companies have terrorism insurance, an attack like the one on the World Trade Center -- which caused at least $40 billion in financial losses -- would probably have a much more devastating financial effect today than on Sept. 11.
As a result, imposing a write-down in the value of Italy's debt, a so-called haircut, would have a much more devastating effect on bank capital levels than the 50 percent reduction in the face value of Greek debt agreed to by European leaders last month.
The Kimya II operation seems like it will give birth to a much more devastating and all encompassing war.
At this, Barlow pulled Phoebe into a parallel position to Africaine and unleashed a much more devastating broadside from close range.
Some have predicted that Johnson could take a much more devastating toll on Mitt Romney in the battleground state of Ohio, where he could leach votes from highly conservative or libertarian voters not satisfied with Romney's credentials.
Notaro takes the events of her life, which she's written and talked about extensively in her book (I'm Just a Person), her Netflix documentary (Tig), and her standup cancer, double mastectomy, an intestinal disease called C diff, and the death of her mother in a freak accident and switched around the order a bit to make everything just that much more devastating.
That some measure of humanity still flickers in this cruel landscape makes the film that much more devastating.
Many glaciers, ranging from the Andes to the Alps, are in recession, but the impacts of the Himalayan glaciers' recession could be much more devastating.
But Guatemala's history of greater income disparities, between the upper classes and the rural indigenous population, made the effects of negative economic factors much more devastating.
