Thanks to GamersWithJobs for their piece discussing a new study about teamwork in online games.
The study homepage
has a PDF download of the student-authored paper, which is based on a survey interviewing "a total of 4,712 people"
about their team-based gaming experiences online. In terms of improving and evolving teamwork, a variety of options are discussed: "A central commander role like in [Half-Life mod] Natural Selection supports the team aspect... and received positive feedback. However, an unskilled commander might destroy the team experience, as indicated by the votes for S2's Savage."