I’m a fan of old-school Shadowrun (2nd ed.); it didn’t matter how bad-ass your character was, you could get killed by a lucky shot from a punk with a zipgun. It kept the grime of Cyperpunk, and added fantastical elements to it. IMO, it required more role-playing than is strictly necessary in a lot of D&D games, because going in guns blazing all the time was almost certain to lead to death; properly played (IMO), the GM should be brutal in how they handle stupid players.
The downside was so many six sided dice.