Crusaders was an interesting rondel action/selection game that had a clear path to victory thanks to the unbalanced 'Influence' action. Fun med/light game at all player counts but quickly wears out its welcome
Divine Influence does exactly what an expansion to a good but flawed game should do, fix the flaws and deepen the gameplay without making the rules more complicated. It simply offers more choice and mix of playstyles than the base game.
Together they make an attractive package at the total price point.