From the top row of seats in the stadium on the 3rd tier. Tier 3 has a steep 34˚ incline.

The Tier 1 is more gradual at 20˚, and Tier 2 is 29˚. Lateral space was minimized, so it's quite cramped to move through the seats when people are sitting in them. And there's no walkway traversing the seating area on the cramped 3rd tier. Go back out to the concourse to move to another block.
The stadium was designed this way to keep the seats closer to the field. I must say, it is effective in that sense. The field looks closer and you get clear views with no heads in the way. In the old National Stadium, the top row was faraway from the field.
This top row is also right below the open-air part of the stadium and if it's windy and rainy, I would think people may get wet here. Must be cold in winter to sit here. But in summer, it might be cooler when there's a breeze.