If anything, "Long Gone Summer" is a time capsule of a wonderful summer from 22 years ago, when baseball ruled the sports landscape -- perhaps the last time, except for a few weeks in October 2004 and October 2016, when the national pastime could make that claim without any arguments.
Of course, we now know the events of that summer were not just a joyous ride, but a dirty one as well. Still, the movie works as a nostalgic if bittersweet remembrance of the great home run race. I suspect your reaction to it rests on how you view the entire era of performance-enhancing drugs.