I like how the Tank class "feels" and looks heavy and encumbered. Everything from the armor design, to the animations, and including the sound design.
Then you move to the relatively lightly armored ranger class with less armor, and more fluid animations and less heavy sound design.
And then you finally arrive at the totally unencumbered free moving mage that us much more movement freedom but at the cost of having no armor protection at all.
If nothing else, they did a fantastic design with emphasizing the roles that each of those 3 classes are a part of.
Regards,
SB