I'm tired of comic book movies at this point, so I'm never really pumped to see one anymore. That said, Ant-man was above average, which is a good achievement since the whole thing seemed to be an afterthought for Marvel.
I think it was painted in very broad strokes... Ant-Man is doing it all for his daughter got hammered home to the point of annoyance, and the things they set up as big issues like "going subatomic" or brain damage from repeated resizing just became non-issues by the end. Also the Anthony Mackie cameo was shoehorned in there just for a link to the Marvel universe that didn't help the Ant-Man story.
But the young Michael Douglas thing was cool, and the villain was so over-the-top evil that he was hilariously entertaining.
I'd give it a thumbs up.