FLCL is a must see for anyone and everyone. Not only that, it should be seen more than once.
As far as animation goes, and not just anime, it is arguably one of the best works of all times. There are no weakpoints other than the fact that in order to get half of what is going on you will need to watch it twice. On the surface it may be seen as an ahead of its time "lolrandom" coming of age story, but that is not what it really is. If only for the insane density of it, the sheer amount of details everywhere, and the way that the complete lack of uniformity of art and machine-gun reference speed, this deserves to be called a work of art.
There is a dazzling lack of uniformity when it comes to the animation and story, that is held together by the soundtrack and characters. This makes a distinct sense the more you watch it, as the art and story are carefully crafted to pack more information in every scene than should be possible. In the end, it is a carefully told coming of age story, but beyond that it is a delve into human nature with some philosophical undertones. Most of all, it is funny, it is moving, it is angry, it is beautiful, and most of all, it is anarchy personified.
In the end, it is first and foremost a coming of age story. But saying that is like saying "a spaceship is just a thing that flies" - technically true yet missing the entire point. There are endless tangents, metaphors, references, and so on that cover subjects from personality disorders, broken homes, finding your own place in the world, the definitions of fun... and that is just the tip of the iceberg. Everything is well thought out, and nearly no sentence has no meaning.
How is this managed? Well... the price is consistency. The changes in the tone of the narrative are fast, the changes in meanings are faster, and the amount of details is (for a lack of better description) insane. It manages contrasts such being nonsensical and grim, metaphorical and silly, childish and heavy. Sometimes at the same time.
But as I stated, at the heart of it all is a coming of age story, and while it was quite revolutionary (and definitely the best) at the time, in over a decade since, other people have pulled it off in cleaner and better ways. In 2001, this was an easy 10/10, but in 2014, the fact that it is so packed into under three hours of content makes it a strain for anyone who does not watch the entire thing multiple times. That being said, it is still wonderful and far above the run-of-the-mill average.
There are a few flaws. A lot of them actually. Everything is wildly inconsistent between scenes (and sometimes between shots and even in the same frame). You can see that animation has progressed since then. The character designs are (at least nowadays) run-of-the-mill.
But, and this is the brilliance of it all, this series turns weakness into strength. There are parts where the characters are near featureless, but that fits in with the story. There are parts where the format is just scrolling through a manga book, but that fits the story. There are parts where there are obvious mockeries of other works (The Matrix, South Park, etc), but again, that fits the story.
Ridiculously stupid mechs, featureless faces with an intense zoom putting them in the center, nearly unmoving characters at certain points, static backgrounds, bland features, and so on. But at the same time, a powerful connection between them all, that makes it all work together. This is not a modern super-high-budget animation, but it is proud of being what it is... and that makes up for it. You don't have to be polished in order to be amazing, and since FLCL is all about a feeling of rawness, that is just fine.
This is the go-to of how to make a soundtrack alive. Cartoonish effects, energetic rock music, emotive and distinct voice acting, and all these give a definition to the story and animation that it would otherwise lack. People often criticize and say that musical themes repeat too much in FLCL, but the point is that they have to - because this adds a level of coherency that ties everything together. Without the soundtrack, FLCL's choice of animation and story just wouldn't work.
I usually try to go more in depth, but in a series where everything is greater than the sum of the parts, this is the engine that drives everything. There has never been a better fit of sound to animation. Nothing more needs to be said.
Oh, we've seen them since many times. Anime, like literature, movies, and so on, makes repeated use of archetypes. FLCL is one of the defining pieces of art whose influences last until today. Naota's character has since been copy-pasted into so many works that it is just ridiculous. Haruko is the embodiment of the wild, violent, assertive, selfish, yet ultimately decent-sort-of-person female character. Mamimi is the fragile girl that broke.
We've seen these characters done before, and done again since. But still, for the amount of runtime that this has, they are developed to a wonderful degree. These are not the best characterizations ever. But they are definitely well done. Haruko's nasal voice, gangly physique, and predatory grins match add up to a roguish charm. Naota's inability to show when he is overwhelmed to a near pathological degree is all the more impressive when the lie becomes truth just as much as when the truth becomes lies. Mamimi... well, analyzing this character can go from "future serial killer with traumatic past" to "that odd girl whose coping mechanisms are weird" once you try to put her into context (and attempt to figure out where the metaphor ends and life begins).
Are they the best characters ever? No. Are they great? Yes. Are they unique? No. Are they interesting? Absolutely.
Perfection... upon multiple vieweings. The first viewing you just strap on and ride the episodes out. The second, things start coming together and details you haven't picked up on suddenly start making sense. The third, and you've already admitted that this is one of the most pleasurable things ever and you want to see it a fourth time at a later point.
I have never had more fun watching anime then when I discovered this series, and since it is not a category listed, right here I will state: 10/10, would watch again and so should you.
One of the greatest pieces of animation ever. Brace yourself for the insanity and wonder that is FLCL. Watch it now.
its must see to know that its shit fuk elitists