I admit I use to be one of those people who wrote comments like "Omg this is shit" or "Its crap, you need to add this, that or the other" but I have changed alot since then and I always try my best to give constructive criticism comments rather than just criticism.
However I think you'll find the majority of people who leave comments like "Its bad" are newbies who recently joined the site. Maybe you should make it more clear somehow Reed that these comments are not acceptable. Just a lil suggestion.
"If you want to make the world a better place, take a look at yourself and make a change."