Oh, I am not a big fan of sandwiches. The only time I've really seen it used is in my flute studio class; after a person played, people would give comments and it seemed almost required for people to give feedback in the fashion of 'positive,' 'negative,' 'positive' because everyone used the method so much. As nice as it sounds for a way of communicating, it really can be completely useless. A lot of times the 'bread,' or positive comments ended up being fruitless things that everyone was praised for; hence, the positive comments weren't really personalized to the individual but were simply thrown in before getting to the actual critiques. This seems to devalue what the person actually did well - for instance, if they actually did something good then its harder to tell if the comment is honest or just thrown in as a piece of bread. Furthermore, the positive comments can often take away from the 'negative' comments, which are the comments that are actually meant to improve the person's skill. Hopefully when having a conversation in which someone is being critiqued, each member should be mature enough to be able to handle criticism and use it constructively. I feel like the excessive use of positive comments can take away from actual constructive criticism. Though, I don't think positive comments should be completely removed from a critique - they just shouldn't be required and should be used only when a person actually showed some type of improvement or skill that should be commended.