I tend to lock myself into a certain playstyle before I even start the game. I generally plan things like "I'll play aggressive as Hannibal or Genghis" or "I'll rapidly expand as Justinian/Joao to make the most of the Imperialistic trait." I never seem to go for other victories such as Cultural or Diplomatic. Nearly always Domination or Scientific victories. I would like to try and win a cultural game but this seems to be need to be planned from the start because an immense amount of culture is needed. It would be too late to say "I'll try for culture" half way into the game.