I found the rules of Shadowrun the most realistic and also playable, Second Edition if I remember right, I didn't keep up - I just hate the setting and the artwork with a fury. I don't remember all the exact details, but splitting damage into stun and health, having damage an effect on your abilities, rerolling sixes so that with good luck a weak weapon can do a lot of damage, damage modified by weapon skill (accurate aiming), adding inborn ability to learned skill together (not the most realistic but better than nothing), having dice pools reflecting what you pay more attention to, and the cleverly cinematic karma pool, are all things that seem like cinematic realism to me and IMHO playable. If only the rules were more open source like the d20 and used in different settings that make more sense... having both technology and magic is not necessarily a bad idea but somehow the Shadowrun world manages to make it very childish, and the novels that introduced the world are pretty much the weirdest fantasy I have ever read, just who comes up with the idea of a fundamentalist Christian hero who is also a peacenik hippie and refuses to use weapons in a cyberpunk-magical world?...