One of the things about sounds that I don't like from engines and any kind of machine is "mechanical" sounds; tappets, valves, fin ringing, you name it. I love the sound of a nice exhaust, and even undampened intake air sound.
But beyond that, I know what's going on inside the engine, what's rotating and what's reciprocating, and I just don't want to hear that stuff.
Some people like it, I don't. That's one reason I like water cooling, it quiets a lot of that, but engines cover design and smart engineering can get rid of a lot of noise, also.
That's one reason that a long time ago, when Harley Davidsons were considered to be technologically advanced, it was partly because they were very quiet, and were often referred to as "silent grey fellows". This applied to exhaust systems, to a great extent, but a lack of engine noise has always been, and often rightly so, associated with advanced design and manufacturing quality.
I had a Honda CB450 in 1971, and even though that was 38 years ago, and it had dohc and was air cooled, it had very little mechanical noise. About like a sewing machine. If you wanted it loud, put on some loud exhausts. Plus it would spank a Bonnie.
Just my opinion.