To call this film 'experimental' or 'daring' is putting it mildly. Remember that Disney had made the world's first feature length animated movie only 3 years before 'Fantasia'. Then again, perhaps that's how Disney was able to try something this different on: there was barely a tradition to defy back in 1940.
It's a bit ironic: 'Fantasia' was a critical but not a commercial success at the time. I grew up decades later with my father telling me how it was so far ahead of its time, and that nobody was ready for it - and throughout the later quarter of the 20th century I think 'Fantasia' was held in a sort of awe, as Disney's greatest masterpiece. A film that was too highbrow for a 1940's audience.
Today, things have swung back the other way a bit. Nobody really cares any more whether it was highbrow or not, and if you do away with the snob value of digging such an experimental, unsuccessful, 'artistic' film, you find that it's not quite the masterpiece you were brought up to believe. Absolutely 10 out of 10 for daring, and 'Night on the Bald Mountain' is so awesome that it lifts 'Fantasia' up to three stars all by itself - but I have a similar reaction to Athena. Maybe I'm a lazy viewer, but I like a fairly straightforward narrative, too. Add to that the fact that some of the 'segments' work quite a lot better than others, and that the spoken introduction seems awfully dated and clunky, and you're left with a film that I'm glad Disney made, but equally glad he only made once. As a matter of fact, I'm inclined to enjoy the Italian spoof/tribute 'Allegro non Tropo' a little more!
HistNote: I think this is the last feature movie Disney himself actually does voice work in (Mickey in the Sorcerer's Apprentice scene)