Have you played Fallout? If not, then you have to. Ope world games are my favorite. You build up a complex character, weaponry, relationships and, of course, get to fight many bad guys.
The thing is, you may be the bad guy and you may not know it. The beauty of the game is given by the plot (post apocaliptic world), the insanely big world to explore and, also, nice graphics. In the pic above you can see The Scream, Fallout edition. They nailed it pretty good.