The Group Thing bring a more rounded and competitive experience to the Multiplayer Left 4 Dead scene with TGT ProMod. Better scoring, far more options for teams to take advantage of, and better match-play settings.
Concept of radar-chart style area scoring.
For those interested, 'Ammo Used' is probably more like 'Ammo Conservation', as is with health. So the 'green' team conserved more ammo, and therefore got a higher percentage than red.