Was the First World War German Project 50 submarine a good design?
Short answerNo; it was an attempt to obtain SSN-like performance from technology that could not support it.
NotesThe question concerns the German First World War Project 50 steam-submarine proposal. The comparison is with British attempts to build steam-powered submarines. Its intended performance is likened to what would later be associated with nuclear-powered attack submarines. The technology available at the time is judged insufficient to deliver that ambition.