When you walk across the plaza in front of the building, you do get the sense that this is a building with a message. And that message is: We will crush you.
I've only seen it in photos, but to me it looks like the kind of place where a dystopian military dictatorship tortures its political prisoners. Or maybe like one of the army base levels from the original Quake, with its blocky polygons. I do see a certain charm in its architecture if I let myself enjoy the absurdity of it, but it does not seem fun to walk through all the useless empty space in front of it on a windy day with this thing looming over you.
It’s truly a building (and plaza) that has to be experienced in person to appreciate it. It certainly provokes emotion. An amazing place I’m glad to have experienced. But I’m also glad that most of the world is not like it.
Speaking as a resident of Boston and the neighborhoods near city hall, that plaza is such a contrast from the rest of the area. Everywhere around it has shops, alleys, and interesting things to see, whereas that plaza was an endless sea of bricks. They've dressed it up better now, but it still feels more like a missed opportunity than a useful civic space.
The one nice thing about the plaza is that when protesters show up there is no questioning their sincerity. You know they're not there for the fun of it.
Notre Dame and other great architecture is inspired by great archetypes, it's a well crafted expression of those archetypes to the extent it's possible in stone and concrete. Simply looking at it drags us closer to the ideas behind it.
But not everyone agrees with that direction. There is a large number of people who would rather take humanity in a different direction, and they build this oppressive architecture of bland geometric forms.