I'm not a huge fast food person, my favorite "fast-food" would have to be Long John Silvers because I eat fish and their hush puppies are the best things ever made. I really wish I lived near a Popeye's because their shrimp and stuff looks really good and I'd love to try it.
I love Subway, worked there for two years and I honestly love getting sandwiches there still. But I don't really consider it "fast food" though I guess it could be considered that, it's more of a dumbed down deli. XD
My favourite fast food restaurant is probably taco del mar, their burritos and quesadillas are just amazing. I like pretty much any Greek food takeout place as well.
I rarely go to fast food places cause the food quality makes me really sad while I eat it. Lol. I went to McDonalds recently on my way down to Florida and ordered a mcdouble with small fries. The burger I got looked like someone sat on it and then gave it to me. It tasted good but it looked rank. XP This basically applies to every fast food burger place, besides Wendys. Their stuff is actually visually pleasing. XD
Subway, if that counts is the only fast foodish place I go to. Same with Tim Hortons, if that counts too.