Intelligence of 3? Fallout 1 and 2? I don't EVER recall seeing that happen, but that's AWESOME xD
But hey, I never played Fallout with my stats ever being lower than 4/5 xD
http://www.youtube.com/watch?v=1yA8IMXOsDQ
http://www.youtube.com/watch?v=Sp6F5Bk8mB8
http://www.youtube.com/watch?v=IuBjeLiWhek
(and people wonder what's so special about these games :fallout: )
you cant really get anything out of the game by being a low IQ character.
there is only so much fun to be had with the dialogue you will hear.
unless you play half the game as a dimwit and then beef up your stats after a while to see how people act.
[I suspect that] the main reason its there is because in Fallout 1 & 2 drug withdrawal can lower your stats; so occasionally your PC would stumble into town and gibber away somebody, but be in too bad a shape to be understood by them, or understand what they say.
This is not the only reason (thankfully), but I'd bet it might be a large part of it.