Good point... Last game I recall that had comedy in it was Final Fantasy 6(3 for the SNES). Well thats funny comedy though. Not kids trying to be funny by being vulgar. Then there is the right in your face. Could be that everyone just wants a game that they can take seriously, probably as an escape from reality in a way. Or that they actually want to be a part of something more than what real life offers them due to a lack of adventure... so it's focused so much on that that it leaves no room for comedy.

Ah... I miss the good old days of gaming; Anything Sierra(early to about mid 90s), Star Control 3, Lost Vikings... Those games had good humour in them. I'm sure there were more, just can't remember them though. :/