You'll get a good 20 hours out of Left 4 Dead 2 just for playing through all the campaigns once. After that the content is mostly doing it again on higher difficulties or with different kinds of challenges. There's also a versus mode where one team plays as special zombies while one team are the survivors. I think that's what's keeping L4D2 so popular still.
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Ah! That's probably it. I was wondering what's fuming the popularity but this online comp mode sounds interesting. Thanks, man!