These things can be grouped in multiple categories.
Users are able to comment the items.
It is suitable for developers because votes are managed by triggers - onBeforeVote, onVote, onAfterVote. Developers can do their plugins which make managing votes easily.
I noticed however a few things. 1. When I make a menu-link to a category the category is not showing up, but just an item.
2. I integrated the component with Kunena. In that case the profile picture is not showing up. When I however integrate with Gravatar the profile-picture is showing up.
3. I want to install and extra language. I searched your site for the language file but can not find it.