When you're watching an episodic TV show (think Lost), who does everything happen to? The main cast. And who drives the action when things aren't happening to them? The main cast. The same should be true in your campaign (which, in a lot of cases, resembles an episodic TV show more than most other types of media): Whenever something worth playing out at the table happens, it should happen to ...

There are awesome moments in the game: A critical that drops the rampaging dragon, dodging the sorcerer's lightning bolt, or seducing the noble woman so your companions can make their escape unnoticed. There are moments in the game when the character fails in a way that isn't fun, or even breaks the table's suspension of belief-- like the ranger who can't shoot anything with his bow tonight, the ...