It’s all about choice. Each race can choose from a number of different classes, and which race and class you select has a real impact on the way you play. Some, like the warlocks and hunters, get obvious perks - demonic minions for the warlock, faithful pets for the hunter - but all have abilities and powers that make them useful in a fight or on a quest. Warriors might suffer from a little demon-envy when they see a warlock’s familiar at work, but it soon evaporates in the heat of battle when your muscle-bound hero unleashes a storm of potent attacks.