This is kind of related. Something I feel needs to be said is that if your intro outshines your content to the max, this hurts you. If your intro is getting me pumped up for something EPIC, and making me think this is about to be AWESOME, and then when it finishes it's you sitting in a room using a grainy webcam going "umm.... so hi... uhhh... I wanted to show you these cool jeans I bought... uhhh" That's worse than if you had no epic intro. If you had no intro I'd be giving you more of a fair shot and not have any expectations, but when I see the huge intro now my brain is ready to be epically entertained, this makes the let down that much worse.