Most of the time I find youtube to be okay, I only had one problem where a user nicked one of my videos and claimed she made it and got a very consise response of "F*** You" when I asked her to take it down, luckly she had nicked other people's videos as well. Youtube didn't want to do a thing about it when we asked, so all the people whose videos she stole us and our subscribers (I don't have that many subscribers but one or two people she'd ripped of had a few hundred) just kept posting "why do you steal other peoples videos?" on every video until she closed the account. Apart from that I found its been okay but I genrally ignore any joke videos or nasty comments because as Yatzee said "Pay them no attention as just like a small child putting the cat in a tumble dryer thats exaculy what they want".