I hope Five Guys doesn't go the way of Krispy Kreme, because the similarities are scary. One lame-duck location in Mississauga. One-trick pony (burgers and not much else). Proven formula that worked in the USA but untested in this country. And unfortunately, an attitude of "protectionism"/"xenophobia" in this country where people will support crappy local product (Tim Hortons, Harveys, Pizza Pizza etc) over superior American product (Krispy Kreme, Five Guys, Papa John's, etc).
I wouldn't knock their stripped-down menu -- it's the same in the USA and obviously it's worked well for them. One casualty of their success is Fuddruckers (which has a lot more menu items/options) which went into Chapter 11: