FLCL sets alot of high standards for the rampart pop culture genre of anime which at the moment is filled with surreal yet very serious anime.
This breaks the boring trend by having the main character hit people with a Rickenbacker 4003 bass guitar, along with a strange robot and the weirdest enemies ever encounted including a giant baseball from space.
The series is only 6 episodes long which is good, it means it doesn't out stay it's welcome but saying that they could've at least released it on one dvd or even two dvds.
To conclude this series is more like a big music video than an anime, the surrealness is so big that you need a guitar hero song in the background to better enjoy the experience

How does one describe FLCL? An intense assualt on the senses, a superkinetic, hilarious analysis on formative teenage years. It's a good show. It revolves around Naota, a young boy from Mabase- a Japanese suburb where 'nothing ever happens'. Of course, with a quote like that, nothing will remain normal, surely? What follows is the first part of a wonderful, heartwarming, clever, action-packed saga, with extraterrastrial maids, jilted girlfriends, a mad father, and mute robots. With some truly great fightscenes (Firestarter certainly ends on a high), a fantastic, rocking score, and a lovable, fleshed-out, yet flawed inside characters, it has to be watched by every anime fan. It's a bit like a cross between Evangelion and Excel Saga.
There are some gripes, however. There are only two episodes per disc (still great, though), and it's hard not to crave more. The voice acting, while almost exactly the same in the dub and sub (except the languages, of course), the voice acting is... interesting. Mamimi sounds slightly drained, but the rest of the cast live to the series' mad standard. It's also an acquired taste. Not everybody can 'get' the series' odd ideas.
But, really, if you can understand it, it'll probably be one of your favourite animes. BUY IT!