Rudd was excellent as that poor schlub who can't seem to catch a break no matter how hard he tries. I'm a sucker for underdog characters like that, so I was rooting for him early on. It didn't hurt that he was a Daddy trying to build a relationship with his little girl.
The movie had heart, and didn't take itself quite as seriously as most of the rest of the Marvel franchise movies. Don't get me wrong: I loves me some Captain America, Black Widow, etc. But I also like to smile and have my heart warmed on occasion. And for that, there's Ant-Man.
Don't forget to check out my own superhero stories: