This is those games that even though have no very different output from innovative standpoint, it offers a very enjoyable experience.
It is very slow pace if you want go thorough very stealth. However, you can also use your rifle and go around without using the sniper (but in this case, what would be the point, skip this game and go for COD or Battlefield). I decided to go only sniper. The crazy thing here is that you get a trophy for using pistol and riffle but not for using the sniper (crazy right?).
The story is not deep enough but it is good enough to follow it to the end. Cut scenes are OK, in some way explanatory.
It is not very different from the third installment but it feels more polished and Italy is a beautiful place to set the environment.
This game is far from perfect. But choosing normal difficulty offers you a pleasant challenge without get frustrated anytime. Some parts are slightly difficult but there are because you are no choosing the right strategy.
This game will eventually be at 9.99 dollars, which will be an steal. Get it. It is a complete game (history multiplayer, among other). Several hours of game for few dollar.