XVIII was an epic time with decissive episodes to occidental history. But, in terms of most enjoyable play time i think XVII was better than XVIII. In the Empire period politics were bipolar between french or brittish alliances for the world dominance. But, in XVII still Austria, Spain like Russian or Ottomans were 1st order powers. Sweden was in their best time in all his history and we still have possibility to enjoy with North america colonization; dutch-portugueese wars; eighty years war final period and 30 years war; the rise of brandemburg (Prussian base); or the very enjoyable disputs between Poland, Denmark, Russia and Sweden. We can`t forget cossaks uprising; Palatinate conflict; Mantua`s sucession problem; Louis XIV ambitions; catalonian and portugueese rebelions in Spain... thinking in a game like total war in this time... it could be only the better in my life (hope my gilfriend don`t read this...).
Empire is a great game but if it would start in 1640 what a great game we would play (for me) the most interesting period in european history.