I had been to 7 national capitols but never before to Washington DC. It was baking hot, and far more humid than I had ever experienced even though I live where we get 100 inches of rain a year. I got to see the Smithsonian, and the Washington Monument and yet, that wasn't matching up with all the pictures of the monument I had seen over the years. ?? The scaffolding creates a whole different and less classic feel.
The scaffolding definitely makes it look ugly. It's too bad it was up when you were there. I hope you got to see the Jefferson and Lincoln memorials at night. They are so beautiful because of the same white marble.