GURPS:Common Sense

Anyone who actually allows / uses this advantage, please rewrite this article if your experience is substantially different from the following.

The Common Sense advantage seems largely useless, as an IQ roll to realize he's about to do something stupid is a courtesy that ought to be granted to any PC. The net effect of Common Sense is to penalize a character by 10 points for being played by an inexperienced, bad, or dumb player.