The name says it all. The thing about this restaurant is that you should go in expecting exactly that "a fat sandwich". If you are expecting an exceptional meal, you will be disappointed. However, going in with the expectation of feeling full, eating some greasy goodness and getting your fill of junk food for the whole week, you will be satisfied.
I have only ever had the sandwiches, and they are all very good. If you are looking for some greasy comfort food, venture to Fat Sandwich Co. FYI, all the sandwiches have some hilarious names and they also have some funny t-shirts.