A while back we made some major changes in the way comments and reviews work on AlternativeTo. What we did was basically to integrate our discussion forum with the comments so that every time you post a comment you start a new thread in our applications forum. Our goal is to make it easy for people to get a good overview about other peoples opinion about the application they’re looking at, but still easy to browse comments and reviews in general in the forum view.
When you post a new comment or review the post is always about one main application but you also have the possibility to tag other apps in that post. One example where this is useful is when you’re doing a comparison between multiple applications. You can also specify if the review or comment is positive, negative or neutral. This will affect the rank of the “main” application you are commenting or reviewing.