Your assumption is correct. Muddy carrots are not an accurate description of the sound.
We all have our preferences in audio - some people will only listen to vinyl while others don't own a single record. For speakers, some camps are hardcore Lowther-type, single-driver fans while others need 20 hz - 50 khz extension and as many drivers as necessary to achieve it. Some are willing to travel to the arctic for polar ice that makes really clean water for the purest possible CD cleaning solution (kidding, I think). Tubes vs. solid state is certainly not the separation it used to be, but I think it's still a valid comparison for this sort of discussion.
Preferences determine what we believe is true to the music and which parts are the most important. Nearly everything is a compromise of some sort. Example - I went over to a friend's house who was demo'ing a nice pair of B&W speakers. I thought they were horribly bright in the treble while he liked them. He then came over to my house and we spent a couple of hours with my Tannoys which I find to be much more balanced. He thought they were recessed in the upper reaches.
Who's right and what is neutral? The concert hall is neutral, but nearly all recorded music has had its dynamics compressed and possibly has been manipulated to sound better on certain (cheap) equipment. Much popular music has been bumped up in the treble and bass before you even buy the CD. How do we achieve neutrality when we don't even know what's on the disc? Further, even if the disc was "neutral", very few stereo systems are capable of bringing that performance into your house.
Ultimately, I think the presentations of both blanks are accurate and both sound better than the original (that still sounds funny to say). I probably will use both, since my taste ranges from classic jazz to electronica to heavy metal to classical (no country). I think the Mitsuis present a little more edge and likely will be preferable with highly charged music, while the Memorexes would be better for voices, horns, and acoustic sounds.
Further, I will continue to experiment. Memorexes (Prodisc and CMC) are the only blacks I can find but I continue to search and will try just about anything I can get my hands on. I will be seeking my own personal neutrality, but that doesn't mean it would be yours.