MEDIOCRE - I went to Five Guys for lunch the other day because my friend was raving about how great it was; the last time that I had driven by the line was out the door, so I figure it had to be pretty good. I was wrong. The food wasn't terrible, but it certainly wasn't anything to write home about.
I think that part of my problem was that I like my burgers pink in the middle and Five Guys cooks their burgers into burnt little hockey pucks...which might be your thing, but it is definitely not mine.