You have a right to keep your opinion, but I don't believe in "low quality letters" - all letters have a place... especially when considering domain names on a global level.
While certain letters don't get as much attention as others, it doesn't make them any less valuable IMHO.... especially when the letter is placed in a location that makes a string of letters pronouncable and worthy of branding.
I can remember a few years ago... people used to jump up and down when a domain name had more than 2 words...
"oh no... nice keywords, but the length kills it" blah blah blah... I knew better then... and I know better now.
AFAIK, the whole 'bad letter' idea applies mostly to acronyms, since there are fewer dictionary entries for those letters. Therefore, it is of help when a three or four letter/char domain is evaluated, specially if it's a non-pronounceable one. And even in some cases, you just can't argue a letter is 'bad', IE. xxx.com
I too like the look and sound of XEET. I can even visualize a couple logos for it .
*EDIT*
Whoa! this is my 666th post. What do you do in this case? make another post to make it go away?.