Ant Man was a good movie, I enjoyed it.
Marvel, DC, and super hero movies are starting to lean more toward adult audiences as proved by Deadpool and Suicide Squad. You can't get much raunchier than Deadpool. I think they know, as others already stated, "they prematurely shot their load" with Ultron. They're still going to make those PG movies, but don't be surprised if you see a lot more graphic R or NC-17 rated super hero movies in the future. Especially with the massive success with Deadpool.
If you haven't seen Deadpool, it's probably the best super hero (he's actually an anti-hero, but we'll save that for another discussion) movie I've ever seen. Planning to go see it again, and certainly buying it once it is released, just for the deleted scenes.