There seems two sides of Matt, one is the selfish side that you can hardly help but acquire in our society, and the other is quite selfless...which is probably what people are talking about when saying he's a 'good guy'. The first post documents his selfish tendencies, but consider how genuinely concerned he seems for others:

-sticking up for Kip vs Hutch
-giving honest credit to everyone's comfort item (even went so far as to feel bad that Earl didn't have one).
-giving Dr. P a trip...which to me more than outweighed her 'trauma'.
-went against the crowd and left the room when he felt Gina's privacy was being invaded (granted he read it, but it's tough to do the right thing when you're basically calling everyone else in the room wrong).
-telling Hutch (who he's supposedly in competition with) that he was pissing people off.
-telling kip he had the right card in his trick. I think he even made out-loud comments at other people's low scores...and this was a competition FOR IMMUNITY!

And so on. So while he certainly is the stereotypical American male in many regards, I think he has more selfless tendencies than most.

jlm