I like the peanuts.

If I order a cheeseburger, large fries and a drink, it's more than enough for two people.
In comparison, Burger King would cost more to feed two people, and everything there is gross aside from the Whopper (which is also arguable, but I love them sunsab1tchez).
I don't think five guys burgers are any kind of culinary masterpiece. I do think that if a couple orders smart and shares, it's a good value with food that's above average for fast food. And it's fun.