Well I pretty much comment on most of the new songs on the first page of the user show case rather I know the person or not with the exception of those using Sound Cloud.
I figure if I put my songs up there and get comments then that's the least I can give back.
I try to be honest and fare in my critiques and hope I don't hurt anyone in the process or give wrong information.
As far as you comment on my songs and I'll comment on yours attitude, I've seen that on every song group I've ever been on.
That's sort of human nature.
I appreciate any comments I get on the songs I post rather they are one liner ones like great job or I love it.
That tells me the person took the time to actually listen to my song.
Of course when someone really takes the time to critique my stuff it does make me feel more special.
The bottom line for me though with all this is I try not to take any of it too seriously especially myself.

Tim