Just went here again, today. I don't know what the hell these crazy people who are writing reviews are talking about, but the fries aren't "undercooked". Perhaps that's because you're actually tasting potato in them...
Screw the haters... If you don't like Five Guys, then stay the hell out, so I can get my food faster. Enjoy your cardboard-tasting In n Out, while I enjoy a REAL burger.