The cast is easily the best part of the film. The gang from Ant-Man is back, and everyone shines: Paul Rudd is earnest and goofy as Scott Lang; Evangeline Lilly remains hyper-competent as Hope van Dyne; Michael Douglas' Hank Pym is brilliant and driven; and Michael Peña is a scene-stealer as the chatty Luis. Any interaction involving Scott's daughter Cassie (Abby Rider) is adorable. There are several new high-profile additions in the sequel, and every one of them is *Italian chef kiss*
The plot is equally enjoyable. There are a number of intertwined threads, but for the most part it's a straightforward proposition: our heroes want to enter the quantum realm and retrieve [SPOILER]. Appropriately enough for its micro-protagonists, this movie dodges the thematic weight of, say, the last two Captain America films. This is very much a family movie, as in the overriding theme is family: the one you're born into, and the one you create through shared experiences and goals.
Watching Ant-Man and The Wasp overcome obstacles is exceedingly entertaining. The CGI during fight scenes is very well done, with slo-mo being used sparingly but to hilarious effect. The soundtrack is high octane from the get-go. And the villains are interesting! Ant-Man and The Wasp face off against two sets of antagonists who want the same thing. One pair has surprising depth, while the other group, despite not being terribly formidable, is certainly persistent.
Also: The Wasp has her hair in a ponytail when she's fighting! This alone almost makes up for the movie not passing the Bechdel test. Soon, Marvel, soon you will be less sausage-y and more...y'know, I'm just going to leave this at: Black Widow movie, woo-hoo!!!
In closing, since this is a Marvel movie, there are two end credit scenes: one after the principal cast list, and another at the very end. Stay and watch, and marvel at Marvel's ability to link its movies!
TL;DR: Fun, brisk, and moving.
This post brought to you by summer showers!