An innovative "must play" game.
For being severeal years old, I was extremely surprised by the quality of game-depth it had to offer. I always find it great when a game brings something new to the table. Besides the obvious tongue in cheek humor; there was a level where you are falling out of a plane without a parachute and you must take out an enemy to grab there 'chute.
No One Lives Forever is definately a must play. Once done you'll be happy to know there is a sequel, and a prequel available. Though these lack the superb quality of this first installment, they don't let you down.
Normally I despise Sierra. I have had way too many problems with their products. But this title alone grants them salvation.