Mullins is one of those places that is WAY past its prime and just needs to die, but thanks to its classic reputation and elderly clientele, no one is quite ready to let it go yet.
To give you an idea of how old Mullins is - I grew up in Huntsville, and went to preschool right down the street at Jackson Way Baptist Church. There are pictures of me as an infant in front of Mullins at a family gathering, and even THEN it wasn't a drive-in - so why the heck do they still call it "Mullins Drive-In?" . It's a classic throwback to thirty-odd years ago, from what I can gather.
The food is also a classic throwback. This place is very "meat and three vegetables", with a limited selection of perpetually bland Southern veggies. Can you tell I'm not a fan of this place? I'll still go here occasionally, because my grandmother adores the place and I'm apt to do whatever she wants when I'm visiting her, but I still cringe a little inside at the thought of eating at Mullins yet again. Get your nostalgia elsewhere.