I don't think The Freshman is a bad film at all, and Brando's reprisal of his role as Don Corleone should make it a "must see" for all GF fans.
Broderick plays an NYU film student, who just happens to be studying Godfather II. There's a memorable scene in which Broderick is in his film class, and the professor is showing the class the boathouse scene between Michael and Geary.
As the scene plays for the class, the professor is shown mouthing the words of the dialogue, along with the characters on screen.
There's another great scene in which Brando is shown buying fruit from a neighborhood stand. His costume and the set bear an uncanny resemblance to the scene in GF when Don C. is about to be shot.
The film also features Bruno (Young Clemenza) Kirby, and a cameo by Gianni (Carlo Rizzi) Russo.