So I was watching Attack of the Show where they were talking about the Halo 3 beta, and I thought they were showing footage of Halo 2 throughout the entire segment until they started to talk about the graphics and how it doesn't look much different from Halo 2. And I was like "holy shit, I can't even tell a difference."
I'm not saying you need amazing, eye fucking graphics to justify a sequel, but Halo 3 was supposed to be one of those games that would DEFINE next generation graphics. And from what I've seen, admittedly of a multiplayer beta, it's not that big of a step up from Halo 2.