it seems that lack of soul or engagement is a common theme more so than other critiques.
@marco1 I get that- I've experienced that myself. I think that comes from the designer not understanding that just because the amp is high efficiency that they still need to have a really robust power supply. If its not there the amp wimps out when you turn up the volume.
There's more to it than that of course. In exploring class D amps over the last 20 years, my impression is they vary in sound more than the worst to the best tube amps do. That's a pretty wide range.
I've been playing triode class A amps for most of the last 45 years if that's any help in understanding where I'm coming from...