Try playing the game with stealth. Sneaking, playing nonlethally, or even ghosting the missions adds even more tension and drama to situations.
Eavesdrop on unaware enemies to absorb more background information related to the world and the events unfolding around you. Sometimes eavesdropping updates your objectives. (Similarly, listen to street speaker announcements and read posted signs.)
If you use combat, donít forget to block and counter-attack while an enemy is off-balance.
Often characters have followup lines if you hang out and listen to them (or click on them further). Youíll absorb more about the world this way.
Notes and books also add a lot of background info on the world and events.
Set your brightness so the blacks are really black. The game looks dramatically better.