So Ant-Man has a decent premise, some nice supporting characters, and it’s cleverly integrated into the larger fabric of the Marvel Cinematic Universe.
With the exception of Guardians of the Galaxy, every Marvel Cinematic Universe movie to date has adapted the earliest incarnation of their respective character.
The Marvel Cinematic Universe didn’t even exist then, and the con had yet to mutate into the massive Hollywood press event it would become just a few years later.
The mentor-mentee dynamic between Scott and Hank is also fairly unique in the MCU, and they have some amusing scenes together.