I think Adam has actually become more sympathetic as the series has gone on. Hannah is unpleasant, quite often unpleasant, but I still feel bad for her sometimes. Ditto Marnie. They're young, and people do stupid things, especially when they're young. Plus I love The Sopranos and the characters are far worse than anything you get in Girls. So I'm not averse to shows with unlikeable characters in general.

Also, I don't get hate-watching at all. Life is too short to continue to watch stuff you don't like.