To Cosmic Cube:
Bullets can't kill Wonder Woman. When the DC Corporation revised Wonder Woman, following the Crisis of Infinite Earths, they increased her strength, speed, and invulnerability significantly. When revising the character, Chris Claramont had the option of getting rid of her bracelets. He felt that the bracelets were an intergral part of her character, so he kept them. Wonder Woman once took a hit from an concussive blast with an energy yield of a small nuclear weapon from behind. She was barely fazed from the attack. Diana's taken hits from Doomsday, White Martians, Superman, and Captain Marvel; she shrugged of the hits and kept fighting. Bullets can't kill her. She use the bracelets to either deflect physical blows, reflect energy blasts or bullets back at her opponents, or utilize a forcefield to protect her from attacks that could harm her ( I'll get into this later )
Superman CAN deliver a flurry of superspeed punches. For a recent example, read Superman #207, pg. 23. From this you can see Superman unleashing a series of superspeed attacks upon another cyborg. One thing that has bogged down DC comics is the inconsistencies with their characters powers. You asked the right question. Why doesn't Superman unleash a superspeed punch to every foe he meets and call it a day? Because it would be boring. So the writers rarely make Wonder Woman or Superman use the superspeed against their foes. It doesn't mean they can't. It just would be completely unappealing to have a two-page comic where Wonder Woman just uses her superspeed and knocks the Cheetah out with one punch. Wonder Woman and Superman DO possess the speed to take their opponents down in several moves. But the writers just don't write this way. With good reason too.
Back in the War of Gods storyline, Wonder Woman took on Shazam. Shazam endlessly pummeled her with magical lightining. Magic lightining is extremely more powerful than physical lighening. Diana withstood these attacks with ease.
This is from a previous post concerning the forcefield thing you don't believe exist : According to the Wonder Woman Handbook (found in Barnes & Noble, Graphic Novels section) when Diana crosses her bracelets, she creates a magical forcefield that can deflect and buffer almost any attack. Diana once even reflected Darkseid's Omega Beams back at him using this forcefield (Superman/Batman comic, the New Supergirl storyline). Phil Jimeniz illustrated this maneuver many times during his scribe period for the WW comic. Wonder Woman also used this maneuver when she fought a hybrid of Superman and Doomsday that her arch nemesis Circe created.