I really enjoyed Antman, this is coming from someone who does not enjoy nor watch any of the avengers series. I caught this one for whatever reason, its pretty stand alone with a few points in the "universe". This is why I walked out on Antman 2 because there is so much going on in the marvel universe that I had no idea what was going on, frustrating.
That's basically the same for me. I'm not much of a comic/super hero type fan but I caught the first Antman on one of the movie channels last year and I actually enjoyed it pretty well. I haven't seen the 2nd one mainly because it seems like you probably need to be a fan of the whole universe to really enjoy that one.