First, it's so typical - the 'ordinary', middle-class values, gosh-darnit man, gaining the attention of a goddess-like character (in this case, a real goddess).
Secondly, why? What is so attractive about mundanity, about someone who, as far as I know, has never had the ambition to wonder what's out there, to really explore beyond his roots. Where is the verve for life, the desire to live what years we have to the fullest?
It's not like midwest volk are somehow our moral guide and mindset, as politics throughout the ages have tried to push. As if being closer to the dirt makes you wiser, and more morally correct. History has proved this patently wrong. What I see here is that great Myth of the Wild West, apple pie, a home on the prairie.
Yes, I've read the comics, and the townspeople here are a welcoming lot, but it's almost as if JMS just gave them the stereotypical kind Mid-West township character. That only such down-to-earth people could really accept Asgard. Couldn't happen in the Big City, nope, or say, suburbia. The mythic cultural heartland is where it's at. Just ignore how complex and wonderful human interaction can be, find where the heart's at.
Now, if JMS can give me a reason to care about Bill (which he seems to now, with Bill having the bravery to go after his lady-love), and can avoid just throwing tropes out (Goddess dumps Man because her 'divine' mindset means it's only a piffle) or using them cleverly, maybe I'll take a liking. Maybe.