'A Star is Born' is an excellent film, I definitely foresee Cooper getting at least one Oscar nod (screewriter, director, starring actor).
And if you like it, I suggest you watch the one of the earlier makes as comparisons,the 1976 version starred Barbara Streisand and Kris Kristofferson. The 1954 version starred Judy Garland and the 1937 original starred Janet Gaynor.