I wanted to read the whole topic, but then I realized it was 32 pages long, so I'll just respond to the first post like I bet everybody else did :toothygrin:
I had a self-driven, ever-accelerating exposure to advanced art music once I got into college and started taking music classes. In about three months I realized that almost everything I'd written over the past four years -- not all of it, but most -- was complete crap compared to what I wanted to be writing. Because I was so rapidly forcing myself to advance, my compositional skills lagged far behind my exposure and theoretical/analytical training. I not only got used to criticism, both from myself and my teachers, I began to look for it.
Remember that Family Guy episode where Stewie tries to get Lois to beat him? That's me, kind of :P Sounds lame, but I want so desparately to close the gap between my listening and my writing experience that I tell my profs up front to lay on the criticism as honestly as they can. And honest criticism isn't about self-deprecation. No profs ever told me "you're no good" or anything of the sort. They have told me things, however, like:
And then a seminar-room-full of young composition students nods their heads, and it feels great. I'll admit, this kind of criticism might sound a little harsh because of the imbalance of compliment with critique. But if I had people telling me this stuff four years ago, I might have saved a lot of time.
So my theory on criticism is: As long as you're not mean, honest and complete criticism is crucial and therefore inherently nice. Inconsiderate bashing is the worst thing you can do. Criticizing honestly, completely, and in detail, and suggesting improvements, are the nicest things you can do.
And for those of us receiving criticism (once I post stuff, bring it on!) -- from experience I've learned that it's always possible, and often likely, that your piece has a decent portion of suck mixed in with the good. This doesn't mean it all sucks, or that you suck. It means, if you can hear the suck, that you're already getting better.