Quantumania is a step up from most of Phase Four. It felt like a Thor: Ragnarok impersonation, and lost the fun of the other Ant-Man films.
My feelings are so mixed on Ant-Man and the Wasp: Quantumania. The first two Ant-Man movies were so great because they were low-stakes with self-contained stories that weren't consumed with saving the universe but instead were set in less a fantastical world that allowed the goofy size-changing antics really shine. Quantumania threw Ant-Man into an outrageous world, changing him from the zany character of the film to the normal character and stripping him of some of his charm. Quantumania felt like a cross between Thor: Ragnarok and Rise of Skywalker with some Power Rangers sprinkled in there, and the result was… decent. It really wasn't a bad movie. It has some funny parts and was better than most of Phase 4. Bill Murray was loads of fun for his brief part and Jonathan Majors is going to be an awesome big bad in the MCU. But it all felt like a familiar save the universe comic book movie and sadly made Ant-Man feel out of place in his own film.