That may be true because I'm a pretty tall and lean person and I hate playing Dwarves. Then again, my MMO history includes playing a number of Kobolds in Dark Age of Camelot and Goblins in Warhammer Online, so I could just be really strange.
While browsing the Aion community forums, we came across an interesting post. One of the board members has written up a quick and quirky guide for choosing one of the game's eight classes based on one's personality. Obviously, numbers and stats play a huge factor in making class decisions for many players, but this could be a more healthy approach.
At the very least, you will gain a better understanding of the kinds of people playing these classes, which could give you a strategic advantage when you run into them on the battlefield.