Taco Bell tacos are cheap meat, not particularly flavorfully seasoned, covered in cheese shredded to about the diameter of a human hair that tastes more like the anti-caking agent covering it than actual cheese, and limp lettuce. You can make it a "supreme" and get a tiny squirt of sour cream and a few diced tomatoes.
Yeah, you get hot sauce, which is necessary to make it palatable. And their "Fire" sauce is one step above mild. You don't even get real hot sauce.
Pretty much the entire rest of their menu is the same, except upcharging to wrap that crap in more cheese and a soft tortilla (ooh, it's a "gordita"!), or serve it over chips (ooh, it's "nachos bellgrande"!), etc.
Most fast food is terrible and just designed to fill your face with cheap calories. I get it. But for Taco Bell to be palatable, even when compared to other fast food, you'd better be drunk or high.