From the aesthetic point of view, granted, many people, even famous actors, have crowded teeth and it does not keep them from social and financial success. Some very attractive personalities also have crowded teeth. On the other hand, MOST beautiful and attractive personalities have well-developed jaws, straight teeth, and a WIDE smile. One visit to the magazine stand will confirm this.
From the skeletal point of view, you can find on other sections of the FAQ that crowded teeth usually reflect constricted jaws and all the health complications associated with them.
From the dental point of view, crowded teeth usually crowd even more with age. Crowded teeth cause an uneven bite and as a consequence, an uneven wear pattern. Due to the altered bone architecture, they are harder to clean, harder to floss, and are more prone to gum problems and recession.