I think the book would have jumped a whole point in my estimation if they'd just given the elementalist appropriate 'bending' powers, a la Avatar: The Last Airbender. Make them cantrips or something, but let earth sorcerers extrude rocks from the ground, water sorcerers create shields of water, and so on. Flavor is important, and while a lot of the recent "Heroes of" books had great flavor, the class options in this one weren't as tasty.
Players Option: Heroes of the Elemental Chaos has 160 pages that offer new information on setting, themes, classes and options to add a little elemental zing to your characters. Everything is elemental themed and there is also a detailed explanation of the Primordials and their connection to elemental magic.