This has to be one of my favorite Kitchen Nightmare episodes yet. I have never seen a kitchen so disqusting before in my life. It just goes to show you that there are probably a lot more out there that we don't even know about.
However, the episode makes you think that Gordon is going to give up completely on this family, which would be just cause, but he doesn't and he works hard to fix the mess that their restaurant is in.
The manager is just a joke, I personally would still not eat in this restaurant because you can pretty much guarentee that it would slide back, never know I might be wrong, but I wouldn't be willing to chance it.