There's really only one rule -
CONSTRUCTIVE CRITISCISM ONLY! hahah
that means no "yeah i dont like it."
if you genuinely dont like it give a reason, you can be harshly critical by all means but if you're gonna super "constructive" we want to hear it in specific detail, with pointers and advice on how to better it!
what i'm trying to say is.. just try and be a little sensitive
after that i wonder who's gonna have the guts to be the first to post here!