UI may flow well, except it may flow in a wrong direction.
In 90's there were pieces of software that were close to the definition of "crappy" in terms of bugs, UI flow and even screen flickering, yet they delivered such a value that users forgave their mistakes. First that comes to mind is Macromedia Dreamweaver, also Cakewalk Pro Audio.
UI may flow well, except it may flow in a wrong direction.
In 90's there were pieces of software that were close to the definition of "crappy" in terms of bugs, UI flow and even screen flickering, yet they delivered such a value that users forgave their mistakes. First that comes to mind is Macromedia Dreamweaver, also Cakewalk Pro Audio.