The serving temperature of wines is a very subjective topic.
All wines tend to show themselves best when served on the cool side.
Cellar temperature is thrown around as a rule of thumb, but every cellar is different. Usually good cellars store wines at a lower temperature than most of us would want to drink them. Wines should never be served too warm or too cold. When a wine is too well chilled, it will come across as dumb on the nose, tannic and astringent. One loses all the aromas and flavors to be found in fine wine.