Mass Effect is about many things - exploration, war, adventure, romance, politics and, of course, lots of weird and creepy space aliens. But above everything else, Mass Effect is about choice. Watching the game for just half an hour at this year's E3, Games Radar were positively staggered by the number of large and small decisions the player was forced to make, and how reaching an impact each one had.
It begins before you even start the game. Do you want your hero, Commander Shepard, to be male or female? The selection affects more than your appearance, which can be customized to an infinite degree anyway. Playing a woman will alter certain chapters of the storyline and, because a different voice actor was needed, affect the interpretation and emotion of every scene.