kind of a 'how long is a piece of string' question - each genre has its own, and is fully judged by personal taste
but 3 good ones for my taste from 3 genres
Carmageddon
Civilization 3
World of Warcraft
Oh, and post 500
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believe me - without free porn, just as many people will seek porn out on the Internet, and many more will pay if there is no free alternative, its not like sex is a fad - it can be milked much like any renewable resource - long term
i wasn't born with enough middle fingers
- Marilyn Manson