Why the Viribus Unitis class did not fulfill its promise

What is your opinion of the Viribus Unitis-class dreadnoughts?

They contained interesting ideas, but control and execution problems made them a poor investment.

The Viribus Unitis-class dreadnoughts were a poor return on the money spent. Austro-Hungarian designers produced some interesting ships, and the class began from an attractive plan. Control problems kept the concept from working as intended, though the short answer does not explain the mechanism. An appealing paper design does not guarantee satisfactory service performance.