>>92714754She's not illustrated badly, she's drawn "bad" as in 1940's 'bad,' e.g., cool, sexy, dangerous, etc. It's a double entendre.
He could probably get any toon he wanted, but he loves her, and her looks (or lack thereof, by toon standards) aren't important to him. Think of people like Hugh Jackman or Cate Blanchett, who are super attractive in the classical sense, but have spouses who aren't anywhere near their 'league' visually.