Sometimes I like to chill my beers and warm them up, but most are better when I do not chill them at all. A perfect example would be Great Divide Hibernation, Ive had a lot of that this year and that one has to be warm to drink it. Chilling it totally mutes the character of this beer. The one type of beer that is better chilled is IPAs, or maybe anything hoppy. Ive noticed chilling a beer will have a big effect on the malt flavors, but will have little effect on the hops. So an IPA usually tastes hoppier chilled than it does warm.