Fallout 3 has one of the best rpg mechanics I've ever seen. You are given a main story and your character goes from an innocent being, to going through immersive, large scaled battles with men in power suits and flying vehicles and explosions to change the fate of the wasteland. You are given other side stories which involve raiding shopping malls and going through underground train system clearing any scum you find. You are given decisions that change the way the game unravels e.g. blowing up a town for a luxury apartment. Freeing captured slaves and starting a slave Rebellion. Enslaving people and much more. The overall gunplay/gameplay can be better but for a 2007 game its great. I highly recommend it