Comment Snob is a Google Chrome extension which simply filters user's comments against a set of rules to deem if a comment is probably spam, trolling or just simply written by a 13 year old with their finger on the SHIFT BUTTON. With these comments out of the way you are left in peace to enjoy comments left on a video.
There are plenty of rules built into it, and if you are handy with jQuery you can easily build your own.
You can grab the extension from the Google Chrome Store.
Share and enjoy!