I'm wondering why everyone writes only about Marauders while the most buffed race - looking at these 5 cards only - are the High Elves. Helm of Fortune attached to a unit on Return to Glory is an extremely dangerous combination. Right now the HE combo deck on Return to Glory with Elven Scout and Lore Seeker, in any version (with for example Grudge Thrower, Van Klumpf's Buccaneers or indirect combo) is one of the most powerful decks out there. The Helm will make in unstoppable if the player will take right cards.
Marauders are, I agree, strong. But they are not overpowered because of their cost. Empire was totally OP and needed restrictions because of its ridiculous economics and cheap control, while in Chaos powerful cards are adequatly expensive, so that a Chaos player can usually play only 1 such card a turn, save Quest. All of earlier OP beginnings that were shown assumed one thing: Chaos player begins. Still, I agree that Chaos is most versatile race.
Also, new quest is really interesting. I'm sure that after some time combo decks using it will appear. Obviously, I'm not sure if they will be strong enough to be played on tournaments.