Subway is a no go for me. There's one on campus and it's honestly a waste of money: the sandwiches turn to dust when I bite into them and they're never filling. I went to another one nearby once and it wasn't so bad. There's an even better local place across from it, The Sandwich Spot I think, but they sell out early though. I grew up with Wegmans subs, though, so anything else isn't the same.
The Habit I think is only in California. They've got a whole assortment of stuff, but their burgers are really topnotch. They're not too greasy, they're very juicy, and they have my favorite burger topping, mushrooms. They lettuce wrap as well, which is a plus. Smashburger is another top burger joint and maybe even has a better burger, but overall I think Habit is more enjoyable.
Adalberto's in California is good...reluctant to say great, but a few of the locations make exceptionally tasty food. Chipotle is good, too. I don't know why I don't go there more often.
Are diners considered fast food?
There's a local place, Gatsby's, here in Sacramento. Not sure if it's fast food, really, because it's more of a nice place. I'll say it's one of the best American restaurants I've been to in the country, or really just one of the best restaurants of any type of food I've been to, continent and world.
What a buzz kill. Shakes and malts are the best. No pop for me, though.