In-N-Out's Double Double, protein style, ketchup/mustard, no spread & Five Guys Cheeseburger (LTOKM) are my favorite fast burgers. Five Guys fries are by far the best things out there.
I find White Castle really revolting - the onion smell makes me gag, let alone the meat itself.
Smmich wise, when Subway first started I had them fairly often but have completely given up on them over the years, I like the soulless comment - its so true. Plus Wawa is cheaper for that kinda thing. First Quiznos came along and they were great, now its Panera Bread & Cosi that cater to any sandwich needs I have. The Corner Bakery is pretty good but there aren't that many of them. Primo has excellent hoagies as well.