While there may be bugs in this new system, it's functionality far exceeds the standard Facebook Comments widget. You can view YouTube videos and images "in-comment" rather than having to navigate to a external page. You can respond to a specific post, and easily navigate through responses. If the Poster has taken a "position" on the argument in question, you will see it next to his/her name. This is useful for reference purposes.
There's a lot more to come, as after all Argumentum aims to be the perfect place to argue online!