If you hated Call of Duty 3 and are only reading this preview to see how bad Treyarch's follow-up is turning out, then stop and reset everything. CoD3 was put together on a small budget with only eight months of development time behind it. Sure, Activision probably shouldn't have charged full price for it considering how derivative the campaign was and how thrown-together the online play felt, but that's not really the developer's fault considering what they had to work with.
Call of Duty: World at War is Treyarch's game, and this time they really mean that it's their game. They've had two years to work on it and this one is not being tossed together as a quick sequel.