Gaming Dead: "What makes a game a sequel instead of DLC or an expansion pack these days? Expanded enemies and tactics? Gameplay and engine updates? Equal or greater playable content than the previous game? Graphics updates?
Considering every other sequel released in the last two months has hit maybe two of those at best, the Left 4 Dead franchise proves that Valve can indeed make a full blown sequel in less than eight years. This of course leads to the inevitable question: What the hell Valve; where's Half-life 2: Episode 3 already?"