This game really surprised me. I do not really play shooting games on XBOX360, but this one is great.
However there are no many collectibles to find. Just gold bars and wine bottles, that are quite pointless to look for. There is more or less straight line in each level and not open world, so you have to go that way.
There is also a challenge mode, where the waves of enemies try to kill you and you have to survive as long as possible. This mode is quite fun to play.
Also I really like some of the achievements and choice of weapons before each mission (you have to think if you need stronger gun or silenced one).
Many enemies, many kills. All in all I enjoyed the game.