_Barbarella_ is a fun sci-fi fantasy. While having the production value to not be a crappy B movie, it definitely leans into the campy nature of the genre.
The movie has some storytelling flaws, however, for the most part, it manages to be entertaining the entire runtime.
Onto the titular character herself: Jane Fonda plays her perfectly. She is a future human who is unfamiliar with hostility - and other types of interaction - and has to use her cunning and trickery to get out of dangerous situations. Another notable detail is the numerous costume changes she undergoes, including no costume. Wowzers!
The movie is clearly not to be taken very seriously, although I'd still recommend it to fans of sci-fi and/or fantasy. If you like _Flash Gordon_ (1980) or even _Jason and the Argonauts_ (1963), this would be a safe bet.
Silly, fun, very imaginative, and quintessentially '60s.