You've probably heard about it already, but in case you haven't, Youtube now requires you to use Google+. They also want you to use your real name, but of course no one is. You can simply enter any name, so there's Obamas and Hitlers everywhere. This also apparently enabled easy posting of ASCII pictures and links. This is the Internet, so I'm certain you can guess what that's being used for. Hooray. Great job, Google.
As for what to do, other than bitching to Google, I'd say... abuse it. Make a Google+ profile with a fake name and post horrible, terrible things in the comments section. Plenty of people are already doing that, so do some more. If they think that doing this will somehow "clean up" the comments, they're mistaken. It's a terrible idea that isn't working and isn't going to. Instead of making more people love Google+, it's going to do the exact opposite. No one likes being forced to sign up for a social network just to do something.
Of course, you can simply do away with the comments section altogether. I usually have it blocked myself. If you have Firefox, download adblock plus (or adblock edge, which I personally use) and install the element hiding helper addon for adblock. Add a custom element blocking rule "youtube.com###watch-discussion" without the quotes, and the Youtube comments section will be gone forever.