I really enjoy the Hero System because it uses reasoning from effect for everything like super powers, equipment, etc... You can define how your character is exactly the way that you want it. No random generation either. The core rules uses a simple 3d6 die mechanic to resolve everything except damage. The optional rules allow you to define how you want the game to play. The upside is the Hero System can do any genre well and has a devoted fan base that will help a new Hero player with any questions they have. The downside is the many options available for characters and the GM.