OK, so maybe "so many" is a bit hyperbolic, but in my (admittedly limited), experience, AoU is consistently singled out as one of the more heavily and unloved MCU films. Honestly, it feels like AoU is almost as disliked and bashed as the first two Thor movies and Incredible Hulk. And I just don't get it. I loved Avengers: Age of Ultron. I thought it had a very good Ultron voiced brilliantly by James Spader, wonderful action and visuals, some of the usual great Whedon deadpan quips, and honestly, a solid story of Stark letting his fears get the better of him and driving him to make a terrible mistake. All of that seems like a perfectly solid movie to me.
I mean, I know a lot of people disliked the Banner/Black Widow romance, but I honestly thought that was fine. And if Ultimate Spider-Man and Kitty Pryde is acceptable, I fail to see how Banner and Nat is anymore outrageous or illogical a pairing. And even if you don't like it, that shouldn't ruin a movie by itself.
Other then that, I really have a hard time thinking of just why this movie is so looked down upon and even hated by so many. Can someone fill me in here? Just what are the reasons people give (if any), for bashing AoU? What are the most common criticisms? Because I really can't see just what it is about this movie that makes it an "unfavorite" of the MCU collection.