Is the following review positive or negative?

1 star is only for a decent shake. The burgers that were served to our group of six people were burned to a crisp. There was literally a hard burned shell around the burgers, including a standard burger, 2 black bean veggie burgers, and 2 orders of sliders. The waiter literally admitted that the sliders are always either "burned or raw" since they are "only 2 ounces each." We were in a big rush to get to the airport so couldn't spend time to speak with the manager. Many of us ended up leaving our food almost entirely uneaten. Stay far away from this restaurant. I have no idea how they can call themselves a burger joint.
negative