Fast food is one of my downfalls. If it's unhealthy then I love it!

Pizza: Domino's is nice but very expensive. It's rare that I see it but as @suzukir122 mentions, Sbarro is real good pizza.
Tex-Mex: I do like Taco Bell but the portions are small so I always have to order two of what I want which ends up not so cheap. Still need to try out Chipotle.
Sandwiches: Subway is good and I do go there occasionally.
Chicken (my favourite): Nando's is always great, hot or extra hot. Otherwise it is KFC, PopEyes or occasionally Allen's if up in Manchester UK. Waiting to try Chick-Fil-A.
Burger (second fav): Five Guys (excellent but damn expensive), Burger King, Wendy's. Fatburger (Had a few amazing meals there in Los Angeles many years ago at Wilshire Blvd and Crenshaw Blvd).
Breakfast: Greggs and Tim Hortons.

You could add Taco Bueno (they were featured in King of the Hill) to your list, though it may not get any votes.  My last trip there it may have been taco, but it was not bueno.

There's also Taco Time and Filibertos, and for burgers there's Blake's Lottaburger.  That last one is going to have to go on my favorite burger list.

Seafood: Long John Silvers, and Long John Silvers has the ability to hit 10 out of 10, but I rarely go there anymore because the workers absolutely suck.
In terms of seafood, Long John Silvers still remains #1
Pizza: Sbarros = #1. << that was easy.
Chicken: KFC... #1... but, exact same situation as LJS. Horrible workers.
Burger: BJ's Brewhouse... would have been #1, but they got rid of their BBQ Burger that was topped with brisket. AND... I like my burger well done with
no pink. I would always get my burger with pink in it anyways, despite instructions against this. So... as of now I don't have a #1 for burgers, yet.
Breakfast: REALLY close call between Hardees and Crackle Barrel... but Hardees suffers the same situation as KFC and LJS.

The quality of the workers vastly varies by location and the timing. A few years ago, when a brand new McDonalds opened by my house the employees were real jerks, arrogant and honestly would hide in the kitchen and play video games on their phone while trying to fool management like they're working. That was just the first week of its opening, after that those employees were no longer working there and we've had nice employees ever since. I would rather judge a chain holistically rather than just by some employees at a certain location.

Fast food is one of my downfalls. If it's unhealthy then I love it!

Pizza: Domino's is nice but very expensive. It's rare that I see it but as @suzukir122 mentions, Sbarro is real good pizza.
Tex-Mex: I do like Taco Bell but the portions are small so I always have to order two of what I want which ends up not so cheap. Still need to try out Chipotle.
Sandwiches: Subway is good and I do go there occasionally.
Chicken (my favourite): Nando's is always great, hot or extra hot. Otherwise it is KFC, PopEyes or occasionally Allen's if up in Manchester UK. Waiting to try Chick-Fil-A.
Burger (second fav): Five Guys (excellent but damn expensive), Burger King, Wendy's. Fatburger (Had a few amazing meals there in Los Angeles many years ago at Wilshire Blvd and Crenshaw Blvd).
Breakfast: Greggs and Tim Hortons.

I've been to Tim Hortons before, but that's only on travel! It's pretty good and comparable to McDonalds yet its portfolio is a lot smaller in overall scale. I've never been Sbarros before and I'll make a note to try it. So far I've only heard good things! 

You could add Taco Bueno (they were featured in King of the Hill) to your list, though it may not get any votes.  My last trip there it may have been taco, but it was not bueno.

There's also Taco Time and Filibertos, and for burgers there's Blake's Lottaburger.  That last one is going to have to go on my favorite burger list.

I like Filibertos a lot! I've never heard of Blake's Lotaburger before, I have to try it one day.