Hit a guy in the head so hard he's stunned. Gash his brow so he's blinded by his own blood. Issue a challenge that compels enemies to approach, or let out a bloodcurdling scream that inflicts fright. Grapple a dragon. Run past half a dozen enemies with my sword out, slashing them as I pass too quickly for them to react. Deal half damage on a missed attack. Gain extra reactions. Use a reaction to pursue an enemy who tries to disengage. Use a reaction to attack someone who attacks an ally. Create a whirling wall of steel, dealing automatic damage to all enemies within 5 feet at the start of my turn. Hamstring with an attack, slowing or immobilizing the target. Hit a guy so hard he goes flying into his buddies and scatters them like bowling pins. Jump 30 feet straight up from a standing start in plate armor. Knock a hole in a castle wall.Sure, fighters can't do that. What martial thing do you want them to do that would be comparable?
None of these things are out of line with what wizards can do. I'm even willing to have limited uses per day.