Sometimes the rule is even broader: this is what happens when you let your company design the UI (before bringing in a HCI/Ux (user-experience) consultancy to fix/transform it).

Aside from griping with them about the backend machinations/magic required to transform some of their wireframe mock-ups into running code, working with a well-known HCI/Ux firm made our product's UI cohesive, usable, and functional. They also helped us build reusable common UI components. This was a high-profile, multi-million dollar new product launch so the ($$$) money the firm cost was well invested.