Wonder Woman is strong enough to pull 1/3 of the Earth, fast enough to react to Superman at FTL, and durable enough to take blows from the strongest the DC Universe has to offer. She is not out of her league. She has thousands of years experience and training fighting the most powerful monsters, aliens and super powered beings from across the Universe.
And Gladiator destroys planets in an emo rage, is shown going out of an explosion that was could have destroyed 1/3(Or something of that nature, I forget Reed's exact words) of the solar system at 100c(That's 100X the speed of light), wades through stars, and shoots heat vision through the Hulk. He's quite frankly, one of the most physically dominating characters around, The Silver Surfer can't beat him without using his Kryptonite. In a straight up fight, Gladiator is above Marvel or DC Earth.
I see no reason to believe that Gladiator is any stronger or faster in battle than Superman is.
You need only see Gladiator fighting Hyperion in nanoseconds, using nothing but speed to act in a Celestial generated timestop, to see that he can fight faster than Clark.