They are dirt cheap at two for 99 cents.
Jack in the Box's Tacos don't look very good (they looks gross actually, even for fast food) and what kind of taco has a half-slice of American cheese inside?! Also the beef is a mixture of beef and "textured vegetable protein" (like the cheap frozen burritos you buy at the supermarket). Compared to other fast food, the quality is pretty low, but I like 'em.
The meat is paste-like, but flavorful. It probably contains a lot of seasoning because they don't give you much meat. The lettuce is filler and texture. And the taco sauce sets it all off with a tart, vinegary sweetness coupled with a slight heat.
Nutritional Info - Jack in the Box Taco
Calories - 190 (from Fat - 100)
Fat - 11g (Saturated Fat - 3g)
Sodium - 320mg
Carbs - 16g (Sugar - 2g)
Protein - 6g