The script is not the best, however, and there are a lot of minor characters who are amusing, and interesting, and unfortunately, for the most part unimportant. Had more time been spent on Doris and John, this film would have gone from being good to being great. There should have been more scenes like the restaurant scene, and the one in which they walk side by side as he's pushing his bicycle.
I will say I was surprised by how often the LGBT community gets a mention. There's a gay man in her office who talks about marriage equality and takes a date he met on Grindr to a Thanksgiving dinner. Sally has a conversation with a teacher who only teaches LGBT students. She also joins a Lesbian knitting group on a rooftop. In fact, for a while I suspected her love interest would end up coming out. This didn't happen, in case you're wonder.
Honestly, it would not surprise me to see Sally Field getting mentioned a lot during award season, since it's that sort of money shot performance. Doris is a nice person. You like her, you really do like her, and as a result Doris shines.