Saw Ant-Man this weekend. Let me tell you, it was great. I think I enjoyed it more than age of Ultron. It just hit the right note. I am not a huge Ant-Man comics fan. I did read the Scott Lang origin story and an issue where he gets a job working for Tony Stark. Classic Ant-Man was never really my thing, though. I worried about Marvel's ability to put up a hero that would be believable in a battle against super-powered opponents. I saw the movie because I trust Marvel. They have not abused that trust to this point.
This movie should have come out on Father's Day weekend as Fatherhood is a huge theme in this movie. It covers absent fathers, distant fathers, step fathers, father figures, and redemption. I think it handles the relationships pretty realistically, even in the context of and separated from realism, comic book universe.
The action was amazing. They really surprised me with how they handled the fight choreography and the use of Ant-Man's powers. They managed to make the combatants in the fight completely serious and still infuse humor into the fight scenes. In the climactic fight scene you don't get the Spider-man, I am not really taking this seriously, banter (that is fine for Spidey, it his thing). The characters are fighting and it feels like a fight, hate on one side, and a defensive attitude on the other, lightened up by secondary scenes and plays on setting. This created the perfect tone.
Go see this movie, heck, take your dad to see this movie, you both will enjoy it immensely. If you don't have a dad, take someone else's. My girls took me, and the movie was all the better for it.