Usual Total War
With Napoleon Campaign and Napoleon battles as the new features, the rest of the gameplay is more and less are the same with any other Total War game.
The different thing in this game is there are more new technology to research, more different unit, and more war to fight!! Another thing that make this game is better than previous total war series is the battle (both sea and land) are more solid and user friendly. This is what make battle in Napoleon Total War are more intense and enjoyable!!
Maybe after you play this game, you will realize that Total War series is need something different (in this case gameplay features) for the next sequel of Total War.
But still, if you are a total war fans or you want to know more how Napoleon try to conquer Europe, I recommend you to buy this game!!