The Nath and the Drakand are appealing to me but the others didn't really spark that much interest. Two races, the Scinthy and the Zenith, are included but not recommended to be player characters by the authors. Arcane and divine magic are where the game really begins to take off. Arthad is a low-magic world, which I happen to enjoy. First level spells send commoners into panicked flight and warriors are revered for their skills with the blade rather than the sword itself.
Clerics are the ones to really get the short end of the stick.
After the defeat of the Dark God and the routing of his minions, the other good-aligned gods either died off or left. However, the presence of divine powers on Arthad left it infused with power that the faithful can pull upon. Each day clerics must make a Harmony Check to see if they can tap into the divine power. A failure means that they gain no spellcasting until they can make a successful check again. On the upside, however, is the fact that nobody really intends to kill clerics.