is diners drive-ins and dives the best food network show?

It depends what you are looking for! If you are interested in learning about new foods in predominantly US locations that are generally affordable without a competitive element then diners drive-ins and dives, or triple D, may be great for you. Given how many years the show has been on air it is almost impossible to watch a repeat and you usually find something interesting to pay attention to. While it's not competitive, you can definitely see which restaurants make the host super excited versus not. It is a great show to decompress from work or stress before going to bed.