I also checked it out but fail to see the point.
Why watch someone play through hours of a game including loading screens (Dragon Age for example)specially when he does EVERYTHING you'll do yourself in the game and not just a test of the game. Looks like a massive spoiler to me...
Some people follow these videos because they are stuck in a game and are looking for a visual aid in what to do next. Some people want to experience the game without actually playing it (strange, but true), but I think the majority of people who follow 'Let's Plays' only watch LP's of games they have already played. They want to see how other people handle that third level boss that took them an hour to defeat. They want to see which path other people take when the storyline splits. They want to see which of the 108 possible companions other people use to make up their six man party. They even want to see just how many times other people fail during the course of a quest/level/battle.
That said, 'Let's Play' videos aren't for everyone and chances are you won't enjoy an LP of a game you have never played. But I do recommend you at least take a look at once particular LPer
on Youtube. He's done quite a few games. With luck he's done one you've already played. Watch a few of the episodes from the start. If you still don't like the idea after watching some of his videos then I guess LP's really aren't for you. But that's fine of course and you are free to watch or not watch at your leisure.
For those who are interested I will post in here when the first video is up and available for viewing.