My read on Mileva was completely different than many of the ones above. Yes, she was miserable and hated everything, but I saw that as mental illness. I thought the writers were making it clear that she was obviously depressed, and perhaps had other mental illness, not that she was just a harpy. Being that depressed, and having her husband succeed and leave her behind, I could see that making it worse. Plus the son said mental illness ran in the family. I felt sorry for Mileva because she was so depressed and had no treatment and a husband who wasn't paying attention, and children to take care of.