v3.0 Update - General fixes so it works again.
v2.0 Update - There has been a 'View Statistics' option added to the site's functionality, to find to it: close the comment screen ('X' at top-right corner), then press 'View Statistics' button - I am still defaulting the script to 'Show Comments' due to it still being, what I believe to be, the feature most interested people are interested in.
"Hadzy is the best youtube comment picker and great tool to search for comments" - from author's site
Youtube's default comment section does not really work, for example when sorting for 'Top Comments' it does not give real results, it doesn't sort using 'all comments' but only a few. Hadzy provides a useful interface for all comments while providing sortable Date and Likes that can be Searched by username or keywords.
While on any Youtube video page, open the Tampermonkey (or other manager) menu, under '[Hadzy] Youtube Comment Analytics' will be an 'Activate' link, click it or press letter 'A' hotkey to use it.
Basic video demonstration on using Hadzy to view Youtube comments