Saw it yesterday. Thought it was pretty bad.
EDIT: I should say that comics-wise, I only read the newest Ant-Man series (which I loved) and seen him in various crossovers.
Paul Rudd was good, but he was given nothing to work with. The jokes fell flat, and those which did were quickly destroyed by making it overlong or outright explaining the joke.
For instance: the whole "I just ruined the moment, didn't I?" would have been much funnier if they cut shortly after he said that rather than gone on to have the others reply.
Or the Thomas jokes, which were good but they basically repeated the same joke three times. We get it.
The villain was horrible. Terribly cliche and incredibly shallow. I get that hthere was the excuse that his brain chemistry was influenced by the suit, but at the time he did various things like kill that guy in the bathroom, he had never used it (heck, we're only left to assume he used it before we actually see him in it).
The obligatory relationship between the main characters was simply that-- obligatory. No real lead-up to it. No real chemistry.
One thing I saw some people complain over which I thought was fine is the whole MCU integration. A couple of mentions of the Avengers which made sense, and one scene very much involved with the MCU is not too much. The one scene was goofy but it not really deter from the movie-- they needed an action scene midmovie anyway and it produced a few laughs from the audience.
Lastly, one thing I liked that they didn't do is make the new husband a TOTAL douche. I know him getting back together with his wife wasn't in the comic so luckily we avoided the horrible-stepdad-gets-dumped cliche.
Overall, not good. I think it had some potential, maybe Edgar Wright coulda realised it, maybe he couldn't.
As far as I see it, Civil War is Marvel's last chance to show that they can again produce something that's not some trite, off-the-assembly-line, pandering garbage.