Post your favorite level from any game and what ever reason you have for choosing it.
My personally favorite is the 1st Russian mission from Call of Duty
Brilliant Atmosphere, all around Omaha-level beater.
Brilliant sound... gunfire all around you, people screaming and "The man with the rifle shoots. The man without the rifle follows. When the man with the rifle dies the man without the rifle picks up the rifle and shoots!"
Good scripting... like when your on the boat and getting shot at and someone dives out and they kill him... The part where your running from cover to cover etc