3.5, actually. I was quite interested when they showed up after all the hype, and the burgers are pretty good too. I'm sure they're better in the States where you can probably order them with a bit of pink, not dead all the way through.
I have two issues: the fries are way too salty and the price is pretty steep for what you get. You could certainly make a better burger at home for less money, but you can say that about almost all of the new "gourmet burger joints".