With all due respect: EVERYONE want's "honest criticism" --- until they get some. We've all learned who WANTS honesty, and who wants to be flattered after a little time here. So, most of us are cautious.
Giving feedback to someone we don't know, (if I like the offering) I offer big encouragement mixed with slight criticism. THEN, (based upon the response to the slight criticism) I make a judgement about what the poster really WANTS.
From that point on, I only offer the desired amount of criticism on ONLY songs I like.
I'm pretty sure I'm not the only one who does this.