Theodred actually is a pretty mediocre swordsman, he certainly has his tricks and is exceedingly capable as a fighter, but there is no special-ness to his skills in one-on-one combat. Both Eomer and Eowyn surpassed him in such things before he died, winning to him in spars far more regularly than they lost. And likely this was part of what made his assassination a success. He simply could not stand alone long enough for Grimbold to reach him.
















