I will never understand people who waste their precious free time watching other people play games. Looking at combo tutorials in fighting games is one thing. Looking at other people play through entire games seems like the opposite of what I like the most about gaming: having the player decide what to do. It is primarily what sets it apart from other more passive forms of entertainment (movies, TV, etc).
To each their own. Me personally, I like watching some Hearthstone streams to see what types of strategies other people use during their battles. I also like watching some fighting game streams because they are entertaining as fuck to watch even if I don't know what the hell shenanigans or half frame kicks are.
I don't ever watch it for the personality and if the the personality is too obnoxious or loud or annoying I'll just watch some one else.