Back when I was younger, I used to watch my older brother play Nintendo and DOS games in awe of his masterful ability. I suppose watching these let's play videos is not much different. At a certain point, I'd rather be in control and doing the action myself...not watching someone else have fun. But sitting next to someone, you are sort of a 2nd player because you can provide input and ask questions. Watching it on youtube, you are just watching someone else rehashing the same experience.