Dior Homme is anything but "over the top loud fashion". Nearly all their pieces feature clean lines & mono tone palettes. It really doesn't get much simpler.
You are right - Dior do create very nice attractive pieces.
Dior are annoying to me on principle of fit - unless the man is emaciated, there is just no way to fit into their dress shirts or suits without going two sizes too large. Even their 17.5 dress shirts (which are rare / non existent today) fit around chest and shoulders like a typical slim fitting 16.5 shirt. Suits, I made the worst mistake ordering a suit in the size 56. When I got it, it fitted like a 42US size, nowhere near close to the 45/46US fit like I expected. The waist dimensions were perfect, the chest and shoulders were for the super skinny man with small bones. Suit was returned the next day with me feeling very dissapointed - great looking, great quality suit, but bad fit.
So in a sense, Dior are loud thanks to their fits. Just my 2c.