This is just kind of eye-rolling & gross. Here are some real feats.
In Black Widow #3, Natasha fights Elektra to a standstill despite undergoing major surgery a few days before:
Black Widow: Homecoming #1— Natasha cripples some dude for fun, I guess, you can see how fast she's moving by the cup dropping from her hand.
Marvel Two-in-One #10— Natasha fights off 100 armed men, alone.
Punisher/Black Widow OGN: Natasha accurately judges & deflects Frank's bullet, then uses the distraction to sneak up on him.
Wolverine #125: Natasha knocks out the Phoenix with one kick, easily handles Psylocke, Viper, Jessica Drew and such.
Daredevil #368-369: Natasha shoots Daredevil. This isn't so much about beating Daredevil, but Natasha's aim is good enough that she can deliberately ricochet a bullet off his rib cage, causing him minimal harm despite shooting him in the chest.
One time she singlehandedly defeated X-Force, I guess:
There's also various feats that show Natasha's perception and her cunning. Two that come to mind are that Natasha was the one Avenger to suspect something was wrong with Jessica Drew before Secret Invasion:
And Natasha was also the first (and only) person to discover the Thunderbolts were really the Masters of Evil.
@fetts, hopefully this helps.