In-N-Out is definitely the the best, with fat burger trailing close behind. I have tried sonic before and was really not impressed.
As for meets in general, there's always bad apples in the bunch and that's why you kinda learn to keep your meets within a select group of people now and not advertise them anymore so you don't get asshats showing up. That's what kinda happened on vortex, alot of the meets went underground with invites being sent over text and not on the forums so we didn't get the riff raff coming and screwing it for the rest of the people.