I use youtube to get information on various topics and for passing my time. I also earn little extra income with the help of adsense.
Youtube contains almost all the information, reviews, unboxing, comparison, funny videos. Almost each and everything.
I dont think there is anything worst or bad about youtube. I have learnt many things from tutorials, informative videos and all. On top of that its so simple to use. Just search whatever you are looking for and you get many options to choose from.