Maybe it is because all of my husband's family hails from the midwest.

Sorry I'm not being smug here I just see so many people hate their mil or their sil or what have you. I can't relate! I get along with my brother's wife and her family too. I'm wondering if I just really lucked out or if what I experience is the norm?
My MIL is a wonderful lady who made me feel loved and welcome. She made me feel like her son made a wonderful choice and was grateful he found me. Who knows maybe they all talk behind my back.