That's because you're only viewing it as a fight, but there was a far deeper meaning. All Shirou could do was deflect his attacks, so of course it looked "typical". It was more of a one-sided confrontation. It wasn't meant to be a battle of skill, but rather, a test of will -- and to an extent, ideology, if you're familiar with Shirou's backstory.
Gilgamesh has a MASSIVE superiority complex and believes that everyone is beneath him. It's possible because of that ego that he was reborn as the most powerful Servant.
Shirou states "You're a king, not a warrior"; this is especially evident during his rule as King of Heroes.
His sovereign authority was basically "I am a King, therefore, what else is there to it but to obey me?" Governed by selfish desires, he used his men for whatever he wanted, never truly 'leading' them, much like how he nonchalantly summons his swords.
Essentially, Shirou broke him. Gilgamesh saw him as an insect, stood in one place, and barraged him with his Noble Phantasm. That worked for most everyone he encountered. He absolutely refused to take him seriously.
That final moment in the Reality Marble where he steps back is a symbolization of his arrogant pride being broken. He feared him. He admitted defeat; something he has never done, with the exception of his battle with Saber.