There are a set number of classes in any given MMO, but the combinations of these classes gives variety well beyond just their appearance or abilities.
Players: When combining classes one must look well beyond just what each class can or can’t do. Each class presents a new option to the battlefield, including when and where they are used best.
Additionally, leaders must also look to the heart of the player who plays the character. The person playing the character is the valued asset, not the character itself. A person who can play their character with the full knowledge of MMO war is worth more than any character type the game can present.