Some people, bless them, just don’t know how to cook. Or rather, they have no instinct for it. Maybe they try to chef up a meal every now and then and it always ends up either burned, undercooked, under-flavored, or over-salted. Cooking requires a non-negligible amount of intuition. Yes, you can try and follow a recipe, but there are still some implicit skills you need in order to carry it off correctly. You need to know what it means to «sweat» an onion versus «caramelize.» You need to know the difference between a head and a clove of garlic. And you need to know what a «pinch» means. I won’t lie, it’s not always easy. And some of the best cooks still mess up sometimes. 

If you’re a bad cook, though, it’s your obligation to recognize that. It’s your job to understand your shortcomings and, most importantly, not foist them onto others. You wouldn’t want someone to do that to you, would you?