Frankly, I think all of the buildings from your link 4 look breathtaking. They inspire a sense of awe and wonder in me - they don't look real or plausible in some way, but yet there they are, in the large. Having lots of ornamentation would very much detract from the un-real-ness of the surfaces.

The church from 3 really does look atrocious though - though even there, the interior where you are surrounded by stained glass seems like it would be quite impressive to experience directly.

Note that I also think other styles of monumental buildings are breathtaking. I was recently in Florence and could barely take my eyes off of the Santa Maria del Fiore cathedral (with its 19th century Gothic Revival facade), and similarly when I saw the Duomo in Milan or the San Pietro cathedral in Rome. But part of the beauty of architecture is seeing different styles. Another stunning building was the Pantheon in Rome - which is extremely minimalistic when compared to medieval cathedrals, but still outstanding in its design (knowing you're walking into a >2000 year old building also adds to the feeling).

I'm sure architects will eventually have their fill with brutalism and invent something new after it, and there will also be beautfiul examples of that new thing, and horrible examples as well.