Something that's exploited is fully taken advantage of. Fear is probably the most commonly exploited emotion used by directors of horror films.
Exploited talents are ones that have been put to good use. And resources that are exploited are being used advantageously. However, this word is quite often used in a more negative way, to mean "used in a victimizing way." In some countries, exploited children are forced to work long hours in bad conditions. When animals are used to test shampoo, most people agree these critters are also exploited.