Personally Im very carefull on giving critique to people. When they do not ask, I will not tell. But when I do, I do it good. I tell them at what parts to get better, and how to achieve that. I will never try to tell anyone off or make them feel useless. Its making me happy to see how often people enjoy reading my reviews and actually find them helpfull.

Sometimes I give pointers when noone asks me to though. I did that once, when I was working on an animation project. Everyone was supposed to be experienced enough to make a decent animation, but this one guy's art didnt look very well.. ^-^;