Avengers: Age of Ultron (2015)

The Avengers seems to get more and more confusing with each film in the series. This is mostly because they keep adding more characters. This is not necessarily a bad thing. The movies are trying to get closer to the source material comic books, which are quite convoluted. There are so many characters in the Marvel universe, and by that standard, the movies actually only feature a small fraction of them. And Gwyneth Paltrow and Natalie Portman weren't even in this one.

The Avengers has always been about action first and comedy second.  Compare that to last year's Guardians of the Galaxy which is just one long joke.  The Avengers does have its comedic moments. The best is Hawkeye acknowledging his uselessness.  That is a brilliant moment of self awareness, and the joke is ongoing.

The central plot of Age of Ultron revolves around artificial intelligence.  Artificial intelligence is interesting because it isn't just a technology/engineering feat, but there are philosophical and ethical issues that are addressed as well.  Avengers doesn't dive very deep into these debates, but it is an interesting plot point that provides for a formidable foe for the Avengers.