so i read the rest of the thread, took awhile... i'll make a couple comments:
yep/put up or shut up i will respectfully disagree on the point some have made (and some, more than others) about the need for someone's work to qualify them to comment or post with authority, for these reasons:
1. a long time ago, when i used to comment in the songs forum, i know for a fact that my observations were helpful to some. in fact there was one person who specifically asked me to critique their song, even though their mixes were better than mine ever got. this bit of anecdotal evidence brings me to my next point.
2. mixing your own stuff can often lead to disaster. most people here mix their own music. for some, the endless tweaking and knob fiddling can take a decent mix and turn it into mush, because they are trying to get every bit of their precious into the forefront. hence the trainwreck of EQ/FX/compression choices when a more objective person could dispassionately find one good thing about each track and make it shine, in about 2 hours time. it is very easy to critique something that isn't yours.
3. "print" quality has a lot to do with mix quality. some of us have better rooms than others to record in, and so a less experienced/talented/knowledgeable person can achieve pretty good results in a great sounding room in far less time than a pro stuck with "bedroom-reverb" on every single take.
4. some people are really good at teaching vs. doing, and some can do both but aren't allowed to share because of copyright. i've learned a lot of great theory from yep's posts, still have some of them saved in a word file. i vaguely remember his response to one request for something he'd worked on was "listen to the radio, you might hear it". now this is the internet, so that could have been complete BS. but i never got the BS feeling from yep.
so to sum up, kind of, my theory is this:
yep is not god, but he knows what he's talking about and is worth reading/learning from. reading this thread, i would say the same about danny. different people, different approaches, both very useful.
i think yep was completely uninterested in the songs forum because (and i say this with no malice) he honestly would not know where to start when it came to technical critiques. there were plenty of times when i felt that way, and i'm not very good at mixing. maybe it's a personality flaw.
some people can learn and explain things well and not necessarily be that good at doing them, but they understand the underlying principles. i've followed the advice of many on this forum, including yep, and in most cases i got better at mixing because of it. i then turned around and offered those same critiques, plus some i learned on my own, many of which never made it into my own mixes.
the songs forum when i first started posting in the songs forum, there were a lot of serious hobbyist/pros there and i considered myself lucky when a couple of them took the time to tear my mix to shreds. i learned quite a bit, but i asked for it, and took things in stride. not all comments were helpful but the ones that were i took advantage of. at that time the focus was on song critiques.
i haven't been there in a while but when i left it had definitely turned a big corner into more of a song swap-meet. nothing wrong with that, but the vibe was (and sounds like it still is) a lot more "moral support" than "technical critique". again, perhaps a personality flaw on my part but that's not really for me. so what i would say about it is this: if you want an honest critique, you should ask for it, and prepare yourself for unflattering responses. and for those offering the critiques - spend your time only if you know the person actually wants more than an "atta-boy".
i could say more but danny already covered it in his first post in this thread