Fun movie!
As a comic book fan (and long-time reader/collector), I appreciated the nods to the comic version of the character, but like they did with all the other Marvel Cinematic Universe characters who've appeared on screen so far, the story is original and I think it can be followed and enjoyed by those who know nothing about Ant-Man before the movie starts.
I won't post any spoilers, but I will say I was satisfied how this character fits into the rest of the MCU and really enjoyed the special effects. The filmmakers did a good job of poking fun at some of the ridiculousness of tiny people fighting each other without it actually detracting from the story. The movie keeps a real sense of humor, which is one of the things I enjoy most about the Marvel movies. I'm interested to see how and what role Ant-Man will play in "Captain America: Civil War" next year.
Paul Rudd does a great job and is actually believable as a title character in an action film, (he's really come a long way from Clueless, huh?) and I love that bigger-name actors like Michael Douglas are all getting on board with these superhero movies. Evangeline Lilly, who already proved she can do action with the "Hobbit" movies, gets to kick some butt in this movie as well. I don't know anything about Corey Stoll, but he makes a pretty good bad guy.
Marvel seems to have figured out how to handle movies like this (ones where most of the mainstream audience knows little-to-nothing about the character.) Put them after most, if not all, the HUGE blockbuster movies of summer, but make them so fun that word-of-mouth will get people to come out. It worked with Guardians of the Galaxy last year, and I think it'll work with Ant-Man this year. For what it's worth, I liked Ant-Man better. I'd give this movie 3 out of 4 stars.
