Orcs are the basic tanks of Dungeon Defenders. Although they are slow, they have both a substantial amount of health as well as strong attacks. They can have an elemental affinity which protects them from certain defenses and damage.
The attack rates of Orcs are fairly slow, but they are also quite damaging. If a fight occurs with an Orc, Squires and Monks should strike and back away while Huntresses and Apprentices should attack out of range from return fire. Take into account Orcs use melee attacks only, thus proving to be quite weak towards certain classes.