Five Guys is definitely overrated. Their patties are good, but the bacon is a total ripoff. They're dried crunch little bacon bits literally on par with the bacon-flavored starch treats we had for my pet pug. The fries are decent at first, but they're so damn greasy that I actually couldn't finish the cup and felt a bit sick, and burgers + fries are my usual subsistence when out of my mom's basement. Everything is really overly greasy there, actually. In-N-Out owns that shit.
EDIT: It's hard to compare them to McDonald's though, since McDonald's is quite dry and doesn't really taste like what freshly made 80/20 patties should taste like. McD's fries are certainly better, however.