I enjoyed the movie. It certainly had its funny parts, some nice action sequences, amazing costumes, spectacular music, fantastic actors (although this is now the second recent movie in which Forest Whitaker has now felt a bit flat), and enough gadgets and tech to dazzle the mind. I liked that the villain felt, not only believable, but sympathetic. I really appreciated that the director did not feel like he had to hold my hand and explain every nuance to me. I loved the underlying theme of the responsibility of powerful nations (the line "wise men build bridges while fools build barriers" seemed particularly appropo).
However, for all of that, I don't agree with this being a "game-changing" movie. It's plot was entertaining, but predictable. A couple of the big reveals were telegraphed well before they occurred (although they still seemed to surprise the people sitting next to me). On top of that, some of the CGI fights felt like we had regressed a decade (although much of the CGI was gorgeous and seamless--which made poorly done moments all the more glaring). For me, this was more of a middle-of-the road MCU movie (along the lines of Dr. Strange and Ant-Man).
Yet all told, I do plan on watching it again, and I look forward to seeing what will be built off of this very solid foundation.