I agree, get the midrange wrong and the rest cannot hold it all together. That's why it took me 2 years to find a speaker to replace my Harbeth Compact 7's--they don't do everything but they absolutely get the midrange right. Other than the Harbeth line with their Radial driver I can only think of one speaker I've heard that measures up in the midrange department--the Quad electrostatics.
My journey for new speakers led me to the Daedalus DA-1's. While they do not have the midrange purity of the Harbeth's or Quad's, they get very close. Like those speakers they are utterly unfatiguing--you can listen for hours without tiring--this because of low distortion combined with pleasing tonal balance. And, unlike the Quads and the Harbeth's, the DA-1's ROCK. They have all the dynamics you could ever want. They are easy to place and easy to drive. And, to your point, the midrange is darn nice if not quite up to the level of the best in the field.
My journey for new speakers led me to the Daedalus DA-1's. While they do not have the midrange purity of the Harbeth's or Quad's, they get very close. Like those speakers they are utterly unfatiguing--you can listen for hours without tiring--this because of low distortion combined with pleasing tonal balance. And, unlike the Quads and the Harbeth's, the DA-1's ROCK. They have all the dynamics you could ever want. They are easy to place and easy to drive. And, to your point, the midrange is darn nice if not quite up to the level of the best in the field.