I thought it was pretty fun when I saw it. Will certainly see it again when it becomes available wherever.
However I feel it was slightly eclipsed by other movies this year like Mad Max and Kingsman because it was not really anything very original or surprising in the movie. More like you feel like getting back together with old friends or something. Also that wierd side plot with thor and the bathtub was a bit clunky. But overall a good time at the cinema.
The only thing that really surprised me was Ultron. I was expecting Terminator: Superhero edition and got an actual flawed personality instead.