Here is my opinion of the various things that Wendy's serves. Surprisingly, I have a rather good opinion of the food there, but there are some things I'd definitely recommend staying away from.
Fries and potatoes
French fries and baked potatoes. How could you go wrong? Most of the time for the fries, they're soggy and lukewarm at most. Potatoes are usually a better option, but watch out: I've serve potatoes that have been sitting in an oven for more than 5 hours and that were rather brown on the inside.
Salads
They usually don't taste too bad. But you probably wouldn't order one if you saw how they are made. The process usually involves laying out about 20 salad containers and literally throwing the vegetables at the trays. Fun to make, but I would stay away.
Spicy chicken sandwich
Easily the best thing that they serve. Whenever I worked on an opening period (from 7 AM to 3 PM), during my break I would eat three of these with cheese on top and a Biggie Dr. Pepper for breakfast. Oh yeah.
Grilled chicken
When you eat a sandwich, you usually just bite into it. If you however took the time to look at the actual meat of this sandwich, 9 times out of 10 I assure that it would look like a disgusting piece of rubber. Close your eyes, focus on the honey mustard, and you're fine.
Frosty
Damn, I love Frosties. But I always get a chuckle when some woman trying to watch her weight would ask me whether they had any fat in them. Hello! This is quite literally whipped up milk fat.
Chili
Finally, I save the worst for last. If you had any idea how this was made, you'd never go to a Wendy's again. In theory, it's a brilliant idea. When you deal with such large amounts of beef, after a rush period, you'd have a lot of left over hamburger on the grill. After about a half hour, it looks like it's rather inedible. But no! Dave found a way to recycle it. When the meat looks like it is no longer edible as a hamburger, it's designated as 'chili meat.' It's thrown into a container and all of the chili meat is collected at the end of the day, placed into a plastic bag, and thrown into the freezer. Each morning, they'd make two pots of chili, which involves taking the oldest chili meat out of the freezer (usually it's been there for over a week), putting about 60 frozen patties worth into a container and boil it on the stove for a couple of hours. Once the meat was all boiled up, they drain it (draining gallons of really greasy water is much more disgusting than you'd imagine) and chop it up with two spatulas. To make the chili, you just add some water, canned tomato sauce, frozen 'vegetables,' a gigantic packet of chili flavoring, and the meat, and simmer this for a couple of hours. Trust me. You're better off getting anything else.