Of course, we all know the purpose of demos isn't to give someone a good idea of how a game looks\feels\plays.
As far as the reviews it has received, every single one I read talked about how incredibly short the single player campaign is, and basically scored the majority of the game based on it's multiplayer. I even saw comments like "almost shockingly short" (
Gamespot), and "criminally short"(
firingsquad), and most of them mentioned a total time of around 5-6 hours. Since I have very little interest in multiplayer and generally purchase games exclusively for their single player, I think I'll pass.