"in its day"
what about today? would it be as fun as say williams flash?
a machine 6-7 years older! 
Flash was produced in 1979 and World Cup in 1978. A year apart - not six.
Flash is the best SYS4/6 Williams game by a long stretch. I remember the World Cup as being a fun machine. I have one to restore in the near future, so I'll be able to answer your question better then !
