Pretty much any RPG these days has to have a dagger wielding rogue character.
A lot of them have reletively "normal" humans wielding two daggers against an enemy that is more than three times their size.
Like in dagon age and Skyrim, you have "normal" people who are taking down dragons with basically knives.
I have a better time believing the burly warrior whose covered in metal and has a 6ft sword, but a guy in leather with daggers?
How? Go for the eyes? Stab them a few hundred times and hope they bleed to death before you get eaten?
If you can sneak up on them and get in a very precise strike, It might be enough to win, but pure combat?