Metro: Last Light will be released soon, and this is what I am looking forward to in the new title by Deep Silver.
AUDIO
Another important part of every game is audio, and without it you could not really get the complete feeling of the situation. Something that would be amazing to experience would be to hear the amount of things going on at one time. For example, traveling through the main parts of the metro and hearing all the conversations and people going on with their lives. This is an amazing aspect to the game and really helps out the environment too.
Even in combat, I would love to be sneaking around and hear the conversation of enemies right before I eliminate them. Feeling the battle cry of your enemies, or hearing the roar of mutants as they attempt to tear off you face. If the audio excels in Last Light, I feel like it will be amazing in helping the player fall into the clutches of the experience.