Left 4 Dead could've had player classes—but the game's co-lead put his foot down: 'no, that is the wrong way to go'

Left 4 Dead has stood the test of time, more or less—and while there hasn't been a peep from the series in years, that's more down to Valve weirdness rather than a sign of a lack of interest from players. Half-Life was galactically successful, and we're all still waiting on a third game. Someday, Gabe, someday...
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