The biggest letdown of Halo 3 was it's graphics (apart from it's AMAZING lighting). Whilst really good, the graphics just weren't good enough to fit with the hype.
Imagine a Halo 4 Gears 2-like graphics to show off, Halo 3-like gameplay and the same $10 million advertising budget.
THAT game would be easy to hype.
starcraft - Playing Games = FUN, Talking about Games = SERIOUS







