That said, I still wish that taxi would refrain from using words like "supercool" (whether it's copy-pasted or not) as justification for a rejection because:
(a) In my whole life, there have been very few things that people told me were "hip" or "supercool" or "sophisticated" that actually WERE. To be honest, most of the music in commerical mediums comes across to my ears as either cloying, obnoxious, calculated, "lame", trying-too-hard, or some combination of the above. Very seldom do I hear music that is genuinely "supercool" on my sonar, and my sonar is just as valid as anyone else's. In fact, I tend to stay away from words like "supercool" because I realize they've been generally perverted and reduced to meaninglessness.
(b) It's an amorphous word which still comes down to individual taste, and as such there's no need to include it - at least not in a return, anyway. If someone wants to say a song doesn't sound like X artist, that's something that can be meaningfully debated. To just say something isn't "supercool" enough (copy-pasted or not) doesn't help me. I've mentioned the copy-paste thing to the taxi folks before, but it doesn't seem like it's going away. Oh well.
(c) The context of "supercool" is constantly shifting. Bryan Ferry is supercool in a way that is totally different from Johnny Cash, for example. As such, it should be sufficient to use the musical references; "supercool" is superfluous in my mind, at least on the return /feedback form.
(d) Yes - music IS an inexact science - which is why I'm so wary of the word "supercool" being bandied about regularly as if it HAS some concerte, absolute meaning - or constitutes a meaningful reason for rejection (copy-pasted for emphasis or not).
To illustrate my point, taxi recently sent me a survey asking how I would like to see the service improved. Regardless of what else I write around it, would they be satisfied with someone saying, "Sorry guys, you aren't being SUPERCOOL enough!"
I realize that taxi is probably just quoting what some of their clients ask for, and I suppose the word could have some legitimate uses depending on the context, but in general I wish the words "supercool" (and "hip" for that matter) would just be semi-retired, already! Especially on returns (copy-pasted or not) where I feel they add nothing concrete/of value.
And I DO so wish that someday someone would realize that there is nothing LESS "supercool" than anything that explicitly sets OUT to be "supercool" (even with great skill and craft) and nothing MORE "supercool" than the artists who don't spend so much time worrying about whether they ARE "supercool."
After all, I'm sure Johnny Cash never asked himself, "AM I SUPERCOOL ENOUGH????"
Almost nothing called "enough" ever is. 
