This review from an Indian paper explains the plot of the movie Chak de! India in great detail. I have heard the plot is fairly predictable but if you are interested in preserving some mystery you might want to skip this one. But the review does actually talk about the flaws of the film which is something I haven't seen yet. The reviewer is particularly displeased that the film places the blame for the decline in (field) hockey's popularity with the surge in cricket's popularity.
And of course it also lists the high points including its adherence to the reality of the state of women's sports in India where even national teams have to contend with sub-par facilities.
And good news for me: I found the movie showing in a theater 35 minutes away. I think it may be worth the trip.