Maximum PC

-Subscriptions don't have a "mark as read" button
-There's no way to "Show all comments by user"
-There's no duplicate detection or reporting in playlists
-There's no user or video blacklist
-There's no user trend reporting for how many times a user has been liked, disliked, or marked as spam.
-There's no way to view all comments at the same time a video is going in the same tab.

EDIT: Link removed.

Please don't pimp your youtube videos here .. discussing your post is fine but using a post to pimp your videos is not.

Thanks.