Fair enough. My point is that Roman legions as you have described were terryfying for primtive and not unified tribes like Germans, Brits or Gaulls even for Car

Fair enough. My point is that Roman legions as you have described were terryfying for primtive and not unified tribes like Germans, Brits or Gaulls even for Carthago. But more sophisticated enemy like in Asia Minor, Parthia or Persia were more then equal match for Roman military science. PS. Eastern Roman Empire had more sophisticated tactics and strategems in my opinion.