Akane Tendo from Ranma 1/2 is always the first one that comes to mind when I think of a bad cook. I feel so bad for her. She really expresses her Amore in her attempts at cooking, but she just sucks at it. And she's got to learn to taste test it before trying to serve it first!
Now Kasumi, she's a great cook! So here's a bad cook, great cook combo.