Here in Texas it is Whataburger for me and then local places. Light years better than In and Out, etc which have struggled in Texas. Honestly, IN and Out which I think is the most overrated fast food food I have ever had. Their fries are offensively bad.
Will leave the possibility that it was just a bad franchise, but the whataburger I went to in arkansas was mediocre at best. I admit I have some bias against places that use styro cups as well.
Agree with Scott that the 5 Guys buns are terrible and fall apart too easily. Our 5 Guys split out of town after a 5-6 year run. They could not complete with local restaurant burgers including a take out Greek family pizzeria which makes the best fries ever to go along with a great burger which you can have any way you like. A rancher friend in town just opened his own grass fed beef fast food burger joint called Graze. The burger is dry but is saved by a “secret sauce” and a sturdy bun. His fries suck but maybe he’ll figure that out. I must admit my historical standard for burgers use to be Bob’s Big Boy in SoCal.
But you live in England. In a noted burger town like Boston, I don’t think a 5 Guys has evah closed (although I agree, I would much prefer to go to a real burger place over any of these fast food joints, even Shake Shack).