On the battlefield, prejudice takes many forms, knows no boundaries, and drives all conflict. In the distant future, humanity will call on its most fearless defenders to confront an emerging threat determined to eradicate all human life as we know it.
Most popular community and official game content for the past week.  (?)
What does popular mean?
It means the content you're seeing has been rated up more than it has been rated down for the given time period.