Minotaurs are used mainly on planets with a lack of good meat, such as Nether. This is because the Minotaurs can subsist on plants and fungi. They do enjoy meat, however.
Minotaurs are good at remembering paths, and thus are often used for scouting areas and clearing perimeters. They are also valued for their relatively high intelligence, which allows them to operate for the most part unsupervised by Korgrath.