My response to this show seems to be almost directly opposite what I've read here so far. I found the episodes to be decreasingly realistic and enjoyable as the short season went on. (I liked the first few episodes.)
Adam and Hannah suddenly getting together feels so false and forced to me. It comes off as Lena Dunham writing a boyfriend for herself. That is, of course, her right as the creator and writer of the show, but the quality suffers (in my opinion) when the plots stray too far from the "real world" outcomes and begin to instead resemble the author's fantasy. I appreciate that the character Hannah
does live in her own head, but when everything around her falls so easily into place (She gets a job,
magically! She gets the boy-- who hasn't shown real interest in her thus far, who is far more attractive than she, who has other, presumably better options--
magically!) the show loses what I consider to be its strength. The comedy exists where the world falls short of Hannah/Lena Dunham's idealized whimsy, and I think they're going to lose that if it continues looking like some bubbly, unfocused fairytale.
I also love Jessa though, so I think this may just be a fundamental difference of taste based on point of view