Dislikes. You should either like something, and give it a boost, or leave it alone. There's no need for a third option. That third option is basically "I don't care for this, and because I value my own opinion higher than the silent majority, I'm not going to go watch something else; I'm going to leave a stain on this persons work instead". Are people not content with disagreeing with something, so that they have to leave some sort of record that says "hey look at me, I'm in disagreement with someone, and rather than take the time to create my own work in response, I'm going to lazily press a dislike button towards somebody that's contributed way more than I ever will, and piss them off in the process". I think the whole hostile culture of the comments sections is in part due to that dislike option. Not entirely, of course, but partly. It's also giving a place to those annoying reply-guy people. Rather than just not watching them, and thus destroying any hope of them gaining revenue, you've got people who can't resist watching their shit anyway just to give them a dislike and post a meaningless abusive comment. If you don't like something, stop watching it.
As for content, I'm fine with it. I mean I don't mind all the shitty lets plays. Why? Because I don't watch the fuckers. You should see how easy it is not to watch them. It helps my stress levels immensely not having to hate all these people.