My wife and I tried 5 Guys after her telling me the burgers were almost as good as Foster's. I'm glad I tried it, for I now know that Foster's is the place to go for good burgers for a good value.
5 Guys is a chain that seems to live off of touting that their french fries are cooked in peanut oil. Yes, the fries taste good, but most people go first for the burgers and second for the fries. Their burgers are good, no doubt, but nothing to rave about. In fact, I would not even put them in my top ten, ranking In and Out, Fatburger, Culver and Steak and Shake to be better burger chains, in addition to a half dozen other non-chain burger places throughout the country that provide a better tasting burger for a better value.
Compared to Foster's, their chief competition in this side of town, 5 Guys' burgers taste about the same but Foster's has a heavier char flavor that I personally enjoy. Most noticeable, however, is the fact that if you add the cost of a burger, fries and soda together, 5 Guys charges nearly $2.00 more than Foster's. So even if the burger tasted as good, it still wouldn't be as good a value.
I have no plans on going back.