It's a pretty neat game, but to those who are thinking about it, a warning that it is a VERY realistic game. There is a lot of killing, a lot of gore, swearing, and TOUGH choices to make in the game, whether to follow a path of good or evil (there's even a karma system telling you how good or bad you've been based on your choices).
For example, you have a choice early on whether to share a piece of special food with a boy your age (you start at birth in the game). The problem is, the boy is a complete bully, and threatens to beat you up if you don't give it to him. Trying to share is not his idea of giving it to him.
Other choices include how to treat a race of people who have been severely exposed to radiation but haven't died called "Ghouls". They look hideous, and have been treated as second class citizens and sometimes slaves, so they're very aggressive to make up for it, but they're still human inside. Crazy cults in the game try to recruit you, scientists gone mad, cannibals, etc. But there is a also a good side you can follow, such as joining the Brotherhood of Steel, a last standing militia trying to rebuild the world, instill the good stuff back into life, and reconstruct a city and maybe even a small town with government other than who pulls the trigger faster. You can help defend cities against wild animal attacks and raiders, search out supplies in crumbling old shopping centers and find medicine to help people who have radiation poisoning.
Very fun game, very open ended, you are not forced onto a track in it at all. You could literally wander the world if you so chose and live in the wild from day to day (although you probably won't last very long), or you can choose to help people and create a life outside the "vault" that you start in (trying not to give too much away about the storyline). Either way, mature gamers only!